| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: scroll.cpp |
| 3 | // Purpose: wxScrolledWindow sample |
| 4 | // Author: Robert Roebling |
| 5 | // RCS-ID: $Id$ |
| 6 | // Copyright: (C) 1998 Robert Roebling, 2002 Ron Lee, 2003 Matt Gregory |
| 7 | // (C) 2008 Vadim Zeitlin |
| 8 | // Licence: wxWindows license |
| 9 | ///////////////////////////////////////////////////////////////////////////// |
| 10 | |
| 11 | #include "wx/wxprec.h" |
| 12 | |
| 13 | #ifdef __BORLANDC__ |
| 14 | #pragma hdrstop |
| 15 | #endif |
| 16 | |
| 17 | #ifndef WX_PRECOMP |
| 18 | #include "wx/wx.h" |
| 19 | #endif |
| 20 | |
| 21 | #include "wx/sizer.h" |
| 22 | #include "wx/log.h" |
| 23 | #include "wx/tglbtn.h" |
| 24 | |
| 25 | // ---------------------------------------------------------------------------- |
| 26 | // a trivial example |
| 27 | // ---------------------------------------------------------------------------- |
| 28 | |
| 29 | // MySimpleCanvas: a scrolled window which draws a simple rectangle |
| 30 | class MySimpleCanvas : public wxScrolledWindow |
| 31 | { |
| 32 | public: |
| 33 | enum |
| 34 | { |
| 35 | // these numbers are not multiple of 10 (our scroll step) to test for |
| 36 | // the absence of rounding errors (e.g. we should have one more page |
| 37 | // than WIDTH/10 to show the right side of the rectangle) |
| 38 | WIDTH = 292, |
| 39 | HEIGHT = 297 |
| 40 | }; |
| 41 | |
| 42 | MySimpleCanvas(wxWindow *parent) |
| 43 | : wxScrolledWindow(parent, wxID_ANY) |
| 44 | { |
| 45 | SetScrollRate( 10, 10 ); |
| 46 | SetVirtualSize( WIDTH, HEIGHT ); |
| 47 | SetBackgroundColour( *wxWHITE ); |
| 48 | |
| 49 | Connect(wxEVT_PAINT, wxPaintEventHandler(MySimpleCanvas::OnPaint)); |
| 50 | } |
| 51 | |
| 52 | private: |
| 53 | void OnPaint(wxPaintEvent& WXUNUSED(event)) |
| 54 | { |
| 55 | wxPaintDC dc(this); |
| 56 | |
| 57 | // this call is vital: it adjusts the dc to account for the current |
| 58 | // scroll offset |
| 59 | PrepareDC(dc); |
| 60 | |
| 61 | dc.SetPen( *wxRED_PEN ); |
| 62 | dc.SetBrush( *wxTRANSPARENT_BRUSH ); |
| 63 | dc.DrawRectangle( 0, 0, WIDTH, HEIGHT ); |
| 64 | } |
| 65 | }; |
| 66 | |
| 67 | |
| 68 | // MySimpleFrame: a frame which contains a MySimpleCanvas |
| 69 | class MySimpleFrame : public wxFrame |
| 70 | { |
| 71 | public: |
| 72 | MySimpleFrame(wxWindow *parent) |
| 73 | : wxFrame(parent, wxID_ANY, "MySimpleCanvas") |
| 74 | { |
| 75 | new MySimpleCanvas(this); |
| 76 | |
| 77 | // ensure that we have scrollbars initially |
| 78 | SetClientSize(MySimpleCanvas::WIDTH/2, MySimpleCanvas::HEIGHT/2); |
| 79 | |
| 80 | Show(); |
| 81 | } |
| 82 | }; |
| 83 | |
| 84 | // ---------------------------------------------------------------------- |
| 85 | // a more complex example |
| 86 | // ---------------------------------------------------------------------- |
| 87 | |
| 88 | // MyCanvas |
| 89 | class MyCanvas : public wxScrolledWindow |
| 90 | { |
| 91 | public: |
| 92 | MyCanvas(wxWindow *parent); |
| 93 | |
| 94 | private: |
| 95 | void OnPaint(wxPaintEvent& event); |
| 96 | void OnQueryPosition(wxCommandEvent& event); |
| 97 | void OnAddButton(wxCommandEvent& event); |
| 98 | void OnDeleteButton(wxCommandEvent& event); |
| 99 | void OnMoveButton(wxCommandEvent& event); |
| 100 | void OnScrollWin(wxCommandEvent& event); |
| 101 | void OnMouseRightDown(wxMouseEvent& event); |
| 102 | void OnMouseWheel(wxMouseEvent& event); |
| 103 | |
| 104 | wxButton *m_button; |
| 105 | |
| 106 | DECLARE_EVENT_TABLE() |
| 107 | }; |
| 108 | |
| 109 | class MyCanvasFrame : public wxFrame |
| 110 | { |
| 111 | public: |
| 112 | MyCanvasFrame(wxWindow *parent) |
| 113 | : wxFrame(parent, wxID_ANY, "MyCanvas") |
| 114 | { |
| 115 | m_canvas = new MyCanvas(this); |
| 116 | |
| 117 | wxMenu *menuFile = new wxMenu(); |
| 118 | menuFile->Append(wxID_DELETE, "&Delete all"); |
| 119 | menuFile->Append(wxID_NEW, "Insert &new"); |
| 120 | |
| 121 | wxMenuBar *mbar = new wxMenuBar(); |
| 122 | mbar->Append(menuFile, "&File"); |
| 123 | SetMenuBar( mbar ); |
| 124 | |
| 125 | Connect(wxID_DELETE, wxEVT_COMMAND_MENU_SELECTED, |
| 126 | wxCommandEventHandler(MyCanvasFrame::OnDeleteAll)); |
| 127 | Connect(wxID_NEW, wxEVT_COMMAND_MENU_SELECTED, |
| 128 | wxCommandEventHandler(MyCanvasFrame::OnInsertNew)); |
| 129 | |
| 130 | Show(); |
| 131 | } |
| 132 | |
| 133 | private: |
| 134 | void OnDeleteAll(wxCommandEvent& WXUNUSED(event)) |
| 135 | { |
| 136 | m_canvas->DestroyChildren(); |
| 137 | } |
| 138 | |
| 139 | void OnInsertNew(wxCommandEvent& WXUNUSED(event)) |
| 140 | { |
| 141 | (void)new wxButton(m_canvas, wxID_ANY, "Hello", wxPoint(100,100)); |
| 142 | } |
| 143 | |
| 144 | MyCanvas *m_canvas; |
| 145 | }; |
| 146 | |
| 147 | // ---------------------------------------------------------------------------- |
| 148 | // example using sizers with wxScrolledWindow |
| 149 | // ---------------------------------------------------------------------------- |
| 150 | |
| 151 | const wxSize SMALL_BUTTON( 100, 50 ); |
| 152 | const wxSize LARGE_BUTTON( 300, 200 ); |
| 153 | |
| 154 | class MySizerScrolledWindow : public wxScrolledWindow |
| 155 | { |
| 156 | public: |
| 157 | MySizerScrolledWindow(wxWindow *parent); |
| 158 | |
| 159 | private: |
| 160 | // this button can be clicked to change its own size in the handler below, |
| 161 | // the window size will be automatically adjusted to fit the button |
| 162 | wxButton *m_button; |
| 163 | |
| 164 | void OnResizeClick(wxCommandEvent& event); |
| 165 | }; |
| 166 | |
| 167 | class MySizerFrame : public wxFrame |
| 168 | { |
| 169 | public: |
| 170 | MySizerFrame(wxWindow *parent) |
| 171 | : wxFrame(parent, wxID_ANY, "MySizerScrolledWindow") |
| 172 | { |
| 173 | new MySizerScrolledWindow(this); |
| 174 | |
| 175 | // ensure that the scrollbars appear when the button becomes large |
| 176 | SetClientSize(LARGE_BUTTON/2); |
| 177 | Show(); |
| 178 | } |
| 179 | }; |
| 180 | |
| 181 | // ---------------------------------------------------------------------------- |
| 182 | // example showing scrolling only part of the window |
| 183 | // ---------------------------------------------------------------------------- |
| 184 | |
| 185 | // this window consists of an empty space in its corner, column labels window |
| 186 | // along its top, row labels window along its left hand side and a canvas in |
| 187 | // the remaining space |
| 188 | |
| 189 | class MySubColLabels : public wxWindow |
| 190 | { |
| 191 | public: |
| 192 | MySubColLabels(wxScrolledWindow *parent) |
| 193 | : wxWindow(parent, wxID_ANY) |
| 194 | { |
| 195 | m_owner = parent; |
| 196 | |
| 197 | Connect(wxEVT_PAINT, wxPaintEventHandler(MySubColLabels::OnPaint)); |
| 198 | } |
| 199 | |
| 200 | private: |
| 201 | void OnPaint(wxPaintEvent& WXUNUSED(event)) |
| 202 | { |
| 203 | wxPaintDC dc(this); |
| 204 | |
| 205 | // This is wrong.. it will translate both x and y if the |
| 206 | // window is scrolled, the label windows are active in one |
| 207 | // direction only. Do the action below instead -- RL. |
| 208 | //m_owner->PrepareDC( dc ); |
| 209 | |
| 210 | int xScrollUnits, xOrigin; |
| 211 | |
| 212 | m_owner->GetViewStart( &xOrigin, 0 ); |
| 213 | m_owner->GetScrollPixelsPerUnit( &xScrollUnits, 0 ); |
| 214 | dc.SetDeviceOrigin( -xOrigin * xScrollUnits, 0 ); |
| 215 | |
| 216 | dc.DrawText("Column 1", 5, 5); |
| 217 | dc.DrawText("Column 2", 105, 5); |
| 218 | dc.DrawText("Column 3", 205, 5); |
| 219 | } |
| 220 | |
| 221 | wxScrolledWindow *m_owner; |
| 222 | }; |
| 223 | |
| 224 | class MySubRowLabels : public wxWindow |
| 225 | { |
| 226 | public: |
| 227 | MySubRowLabels(wxScrolledWindow *parent) |
| 228 | : wxWindow(parent, wxID_ANY) |
| 229 | { |
| 230 | m_owner = parent; |
| 231 | |
| 232 | Connect(wxEVT_PAINT, wxPaintEventHandler(MySubRowLabels::OnPaint)); |
| 233 | } |
| 234 | |
| 235 | private: |
| 236 | void OnPaint(wxPaintEvent& WXUNUSED(event)) |
| 237 | { |
| 238 | wxPaintDC dc(this); |
| 239 | |
| 240 | // This is wrong.. it will translate both x and y if the |
| 241 | // window is scrolled, the label windows are active in one |
| 242 | // direction only. Do the action below instead -- RL. |
| 243 | //m_owner->PrepareDC( dc ); |
| 244 | |
| 245 | int yScrollUnits, yOrigin; |
| 246 | |
| 247 | m_owner->GetViewStart( 0, &yOrigin ); |
| 248 | m_owner->GetScrollPixelsPerUnit( 0, &yScrollUnits ); |
| 249 | dc.SetDeviceOrigin( 0, -yOrigin * yScrollUnits ); |
| 250 | |
| 251 | dc.DrawText("Row 1", 5, 5); |
| 252 | dc.DrawText("Row 2", 5, 30); |
| 253 | dc.DrawText("Row 3", 5, 55); |
| 254 | dc.DrawText("Row 4", 5, 80); |
| 255 | dc.DrawText("Row 5", 5, 105); |
| 256 | dc.DrawText("Row 6", 5, 130); |
| 257 | } |
| 258 | |
| 259 | wxScrolledWindow *m_owner; |
| 260 | }; |
| 261 | |
| 262 | class MySubCanvas : public wxPanel |
| 263 | { |
| 264 | public: |
| 265 | MySubCanvas(wxScrolledWindow *parent, wxWindow *cols, wxWindow *rows) |
| 266 | : wxPanel(parent, wxID_ANY) |
| 267 | { |
| 268 | m_owner = parent; |
| 269 | m_colLabels = cols; |
| 270 | m_rowLabels = rows; |
| 271 | |
| 272 | (void)new wxButton(this, wxID_ANY, "Hallo I", |
| 273 | wxPoint(0,50), wxSize(100,25) ); |
| 274 | (void)new wxButton(this, wxID_ANY, "Hallo II", |
| 275 | wxPoint(200,50), wxSize(100,25) ); |
| 276 | |
| 277 | (void)new wxTextCtrl(this, wxID_ANY, "Text I", |
| 278 | wxPoint(0,100), wxSize(100,25) ); |
| 279 | (void)new wxTextCtrl(this, wxID_ANY, "Text II", |
| 280 | wxPoint(200,100), wxSize(100,25) ); |
| 281 | |
| 282 | (void)new wxComboBox(this, wxID_ANY, "ComboBox I", |
| 283 | wxPoint(0,150), wxSize(100,25)); |
| 284 | (void)new wxComboBox(this, wxID_ANY, "ComboBox II", |
| 285 | wxPoint(200,150), wxSize(100,25)); |
| 286 | |
| 287 | SetBackgroundColour("WHEAT"); |
| 288 | |
| 289 | Connect(wxEVT_PAINT, wxPaintEventHandler(MySubCanvas::OnPaint)); |
| 290 | } |
| 291 | |
| 292 | // override the base class function so that when this window is scrolled, |
| 293 | // the labels are scrolled in sync |
| 294 | virtual void ScrollWindow(int dx, int dy, const wxRect *rect) |
| 295 | { |
| 296 | wxPanel::ScrollWindow( dx, dy, rect ); |
| 297 | m_colLabels->ScrollWindow( dx, 0, rect ); |
| 298 | m_rowLabels->ScrollWindow( 0, dy, rect ); |
| 299 | } |
| 300 | |
| 301 | private: |
| 302 | void OnPaint(wxPaintEvent& WXUNUSED(event)) |
| 303 | { |
| 304 | wxPaintDC dc( this ); |
| 305 | m_owner->PrepareDC( dc ); |
| 306 | |
| 307 | dc.SetPen( *wxBLACK_PEN ); |
| 308 | |
| 309 | // OK, let's assume we are a grid control and we have two |
| 310 | // grid cells. Here in OnPaint we want to know which cell |
| 311 | // to redraw so that we prevent redrawing cells that don't |
| 312 | // need to get redrawn. We have one cell at (0,0) and one |
| 313 | // more at (200,0), both having a size of (100,25). |
| 314 | |
| 315 | // We can query how much the window has been scrolled |
| 316 | // by calling CalcUnscrolledPosition() |
| 317 | |
| 318 | int scroll_x = 0; |
| 319 | int scroll_y = 0; |
| 320 | m_owner->CalcUnscrolledPosition( scroll_x, scroll_y, &scroll_x, &scroll_y ); |
| 321 | |
| 322 | // We also need to know the size of the window to see which |
| 323 | // cells are completely hidden and not get redrawn |
| 324 | |
| 325 | int size_x = 0; |
| 326 | int size_y = 0; |
| 327 | GetClientSize( &size_x, &size_y ); |
| 328 | |
| 329 | // First cell: (0,0)(100,25) |
| 330 | // It it on screen? |
| 331 | if ((0+100-scroll_x > 0) && (0+25-scroll_y > 0) && |
| 332 | (0-scroll_x < size_x) && (0-scroll_y < size_y)) |
| 333 | { |
| 334 | // Has the region on screen been exposed? |
| 335 | if (IsExposed(0,0,100,25)) |
| 336 | { |
| 337 | dc.DrawRectangle( 0, 0, 100, 25 ); |
| 338 | dc.DrawText("First Cell", 5, 5); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | |
| 343 | // Second cell: (0,200)(100,25) |
| 344 | // It it on screen? |
| 345 | if ((200+100-scroll_x > 0) && (0+25-scroll_y > 0) && |
| 346 | (200-scroll_x < size_x) && (0-scroll_y < size_y)) |
| 347 | { |
| 348 | // Has the region on screen been exposed? |
| 349 | if (IsExposed(200,0,100,25)) |
| 350 | { |
| 351 | dc.DrawRectangle( 200, 0, 100, 25 ); |
| 352 | dc.DrawText("Second Cell", 205, 5); |
| 353 | } |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | wxScrolledWindow *m_owner; |
| 358 | wxWindow *m_colLabels, |
| 359 | *m_rowLabels; |
| 360 | }; |
| 361 | |
| 362 | class MySubScrolledWindow : public wxScrolledWindow |
| 363 | { |
| 364 | public: |
| 365 | enum |
| 366 | { |
| 367 | CORNER_WIDTH = 60, |
| 368 | CORNER_HEIGHT = 25 |
| 369 | }; |
| 370 | |
| 371 | MySubScrolledWindow(wxWindow *parent) |
| 372 | : wxScrolledWindow(parent, wxID_ANY) |
| 373 | { |
| 374 | // create the children |
| 375 | MySubColLabels *cols = new MySubColLabels(this); |
| 376 | MySubRowLabels *rows = new MySubRowLabels(this); |
| 377 | |
| 378 | m_canvas = new MySubCanvas(this, cols, rows); |
| 379 | |
| 380 | // lay them out |
| 381 | wxFlexGridSizer *sizer = new wxFlexGridSizer(2, 2, 10, 10); |
| 382 | sizer->Add(CORNER_WIDTH, CORNER_HEIGHT); // just a spacer |
| 383 | sizer->Add(cols, wxSizerFlags().Expand()); |
| 384 | sizer->Add(rows, wxSizerFlags().Expand()); |
| 385 | sizer->Add(m_canvas, wxSizerFlags().Expand()); |
| 386 | sizer->AddGrowableRow(1); |
| 387 | sizer->AddGrowableCol(1); |
| 388 | SetSizer(sizer); |
| 389 | |
| 390 | // this is the key call: it means that only m_canvas will be scrolled |
| 391 | // and not this window itself |
| 392 | SetTargetWindow(m_canvas); |
| 393 | |
| 394 | SetScrollbars(10, 10, 50, 50); |
| 395 | |
| 396 | Connect(wxEVT_SIZE, wxSizeEventHandler(MySubScrolledWindow::OnSize)); |
| 397 | } |
| 398 | |
| 399 | protected: |
| 400 | // scrolled windows which use scroll target different from the window |
| 401 | // itself must override this virtual method |
| 402 | virtual wxSize GetSizeAvailableForScrollTarget(const wxSize& size) |
| 403 | { |
| 404 | // decrease the total size by the size of the non-scrollable parts |
| 405 | // above/to the left of the canvas |
| 406 | wxSize sizeCanvas(size); |
| 407 | sizeCanvas.x -= 60; |
| 408 | sizeCanvas.y -= 25; |
| 409 | return sizeCanvas; |
| 410 | } |
| 411 | |
| 412 | private: |
| 413 | void OnSize(wxSizeEvent& WXUNUSED(event)) |
| 414 | { |
| 415 | // We need to override OnSize so that our scrolled |
| 416 | // window a) does call Layout() to use sizers for |
| 417 | // positioning the controls but b) does not query |
| 418 | // the sizer for their size and use that for setting |
| 419 | // the scrollable area as set that ourselves by |
| 420 | // calling SetScrollbar() further down. |
| 421 | |
| 422 | Layout(); |
| 423 | |
| 424 | AdjustScrollbars(); |
| 425 | } |
| 426 | |
| 427 | MySubCanvas *m_canvas; |
| 428 | }; |
| 429 | |
| 430 | class MySubFrame : public wxFrame |
| 431 | { |
| 432 | public: |
| 433 | MySubFrame(wxWindow *parent) |
| 434 | : wxFrame(parent, wxID_ANY, "MySubScrolledWindow") |
| 435 | { |
| 436 | new MySubScrolledWindow(this); |
| 437 | |
| 438 | Show(); |
| 439 | } |
| 440 | }; |
| 441 | |
| 442 | // ---------------------------------------------------------------------------- |
| 443 | // more simple examples of wxScrolledWindow usage |
| 444 | // ---------------------------------------------------------------------------- |
| 445 | |
| 446 | // base class for both of them |
| 447 | class MyScrolledWindowBase : public wxScrolledWindow |
| 448 | { |
| 449 | public: |
| 450 | MyScrolledWindowBase(wxWindow *parent) |
| 451 | : wxScrolledWindow(parent, wxID_ANY, |
| 452 | wxDefaultPosition, wxDefaultSize, |
| 453 | wxBORDER_SUNKEN) |
| 454 | { |
| 455 | m_nLines = 50; |
| 456 | m_winSync = NULL; |
| 457 | m_inDoSync = false; |
| 458 | |
| 459 | wxClientDC dc(this); |
| 460 | dc.GetTextExtent("Line 17", NULL, &m_hLine); |
| 461 | } |
| 462 | |
| 463 | // this scrolled window can be synchronized with another one: if this |
| 464 | // function is called with a non-NULL pointer, the given window will be |
| 465 | // scrolled to the same position as this one |
| 466 | void SyncWith(MyScrolledWindowBase *win) |
| 467 | { |
| 468 | m_winSync = win; |
| 469 | |
| 470 | DoSyncIfNecessary(); |
| 471 | } |
| 472 | |
| 473 | virtual void ScrollWindow(int dx, int dy, const wxRect *rect = NULL) |
| 474 | { |
| 475 | wxScrolledWindow::ScrollWindow(dx, dy, rect); |
| 476 | |
| 477 | DoSyncIfNecessary(); |
| 478 | } |
| 479 | |
| 480 | protected: |
| 481 | // the height of one line on screen |
| 482 | int m_hLine; |
| 483 | |
| 484 | // the number of lines we draw |
| 485 | size_t m_nLines; |
| 486 | |
| 487 | private: |
| 488 | bool WasScrolledFirst() const { return m_inDoSync; } |
| 489 | |
| 490 | void DoSyncIfNecessary() |
| 491 | { |
| 492 | if ( m_winSync && !m_winSync->WasScrolledFirst() ) |
| 493 | { |
| 494 | m_inDoSync = true; |
| 495 | |
| 496 | m_winSync->Scroll(GetViewStart()); |
| 497 | |
| 498 | m_inDoSync = false; |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | // the window to synchronize with this one or NULL |
| 503 | MyScrolledWindowBase *m_winSync; |
| 504 | |
| 505 | // the flag preventing infinite recursion which would otherwise happen if |
| 506 | // one window synchronized the other one which in turn synchronized this |
| 507 | // one and so on |
| 508 | bool m_inDoSync; |
| 509 | }; |
| 510 | |
| 511 | // this class does "stupid" redrawing - it redraws everything each time |
| 512 | // and sets the scrollbar extent directly. |
| 513 | |
| 514 | class MyScrolledWindowDumb : public MyScrolledWindowBase |
| 515 | { |
| 516 | public: |
| 517 | MyScrolledWindowDumb(wxWindow *parent) : MyScrolledWindowBase(parent) |
| 518 | { |
| 519 | // no horz scrolling |
| 520 | SetScrollbars(0, m_hLine, 0, m_nLines + 1, 0, 0, true /* no refresh */); |
| 521 | } |
| 522 | |
| 523 | virtual void OnDraw(wxDC& dc); |
| 524 | }; |
| 525 | |
| 526 | // this class does "smart" redrawing - only redraws the lines which must be |
| 527 | // redrawn and sets the scroll rate and virtual size to affect the |
| 528 | // scrollbars. |
| 529 | // |
| 530 | // Note that this class should produce identical results to the one above. |
| 531 | |
| 532 | class MyScrolledWindowSmart : public MyScrolledWindowBase |
| 533 | { |
| 534 | public: |
| 535 | MyScrolledWindowSmart(wxWindow *parent) : MyScrolledWindowBase(parent) |
| 536 | { |
| 537 | // no horz scrolling |
| 538 | SetScrollRate( 0, m_hLine ); |
| 539 | SetVirtualSize( wxDefaultCoord, ( m_nLines + 1 ) * m_hLine ); |
| 540 | } |
| 541 | |
| 542 | virtual void OnDraw(wxDC& dc); |
| 543 | }; |
| 544 | |
| 545 | // ---------------------------------------------------------------------------- |
| 546 | // implements a text viewer with simple block selection to test auto-scrolling |
| 547 | // functionality |
| 548 | // ---------------------------------------------------------------------------- |
| 549 | |
| 550 | class MyAutoScrollingWindow : public wxScrolledWindow |
| 551 | { |
| 552 | public: |
| 553 | MyAutoScrollingWindow( wxWindow* parent ); |
| 554 | wxRect DeviceCoordsToGraphicalChars(wxRect updRect) const; |
| 555 | wxPoint DeviceCoordsToGraphicalChars(wxPoint pos) const; |
| 556 | wxPoint GraphicalCharToDeviceCoords(wxPoint pos) const; |
| 557 | wxRect LogicalCoordsToGraphicalChars(wxRect updRect) const; |
| 558 | wxPoint LogicalCoordsToGraphicalChars(wxPoint pos) const; |
| 559 | wxPoint GraphicalCharToLogicalCoords(wxPoint pos) const; |
| 560 | void MyRefresh(); |
| 561 | bool IsSelected(int chX, int chY) const; |
| 562 | static bool IsInside(int k, int bound1, int bound2); |
| 563 | static wxRect DCNormalize(int x, int y, int w, int h); |
| 564 | |
| 565 | private: |
| 566 | // event handlers |
| 567 | void OnDraw(wxDC& dc); |
| 568 | void OnMouseLeftDown(wxMouseEvent& event); |
| 569 | void OnMouseLeftUp(wxMouseEvent& event); |
| 570 | void OnMouseMove(wxMouseEvent& event); |
| 571 | void OnMouseCaptureLost(wxMouseCaptureLostEvent& event); |
| 572 | void OnScroll(wxScrollWinEvent& event); |
| 573 | |
| 574 | // test data variables |
| 575 | static const char* sm_testData; |
| 576 | static const int sm_lineCnt; // line count |
| 577 | static const int sm_lineLen; // line length in characters |
| 578 | // sizes for graphical data |
| 579 | int m_fontH, m_fontW; |
| 580 | // selection tracking |
| 581 | wxPoint m_selStart; // beginning of blockwise selection |
| 582 | wxPoint m_cursor; // end of blockwise selection (mouse position) |
| 583 | |
| 584 | // gui stuff |
| 585 | wxFont m_font; |
| 586 | |
| 587 | |
| 588 | DECLARE_EVENT_TABLE() |
| 589 | }; |
| 590 | |
| 591 | class MyAutoFrame : public wxFrame |
| 592 | { |
| 593 | public: |
| 594 | MyAutoFrame(wxWindow *parent) |
| 595 | : wxFrame(parent, wxID_ANY, "MyAutoScrollingWindow") |
| 596 | { |
| 597 | new MyAutoScrollingWindow(this); |
| 598 | |
| 599 | Show(); |
| 600 | } |
| 601 | }; |
| 602 | |
| 603 | |
| 604 | // ---------------------------------------------------------------------------- |
| 605 | // MyFrame: the main application frame showing all the classes above |
| 606 | // ---------------------------------------------------------------------------- |
| 607 | |
| 608 | class MyFrame: public wxFrame |
| 609 | { |
| 610 | public: |
| 611 | MyFrame(); |
| 612 | |
| 613 | private: |
| 614 | void OnAbout(wxCommandEvent& event); |
| 615 | void OnQuit(wxCommandEvent& event); |
| 616 | |
| 617 | void OnTestSimple(wxCommandEvent& WXUNUSED(event)) { new MySimpleFrame(this); } |
| 618 | void OnTestCanvas(wxCommandEvent& WXUNUSED(event)) { new MyCanvasFrame(this); } |
| 619 | void OnTestSizer(wxCommandEvent& WXUNUSED(event)) { new MySizerFrame(this); } |
| 620 | void OnTestSub(wxCommandEvent& WXUNUSED(event)) { new MySubFrame(this); } |
| 621 | void OnTestAuto(wxCommandEvent& WXUNUSED(event)) { new MyAutoFrame(this); } |
| 622 | |
| 623 | void OnToggleSync(wxCommandEvent& event); |
| 624 | void OnScrollbarVisibility(wxCommandEvent& event); |
| 625 | |
| 626 | MyScrolledWindowBase *m_win1, |
| 627 | *m_win2; |
| 628 | |
| 629 | DECLARE_EVENT_TABLE() |
| 630 | }; |
| 631 | |
| 632 | // ---------------------------------------------------------------------------- |
| 633 | // MyApp |
| 634 | // ---------------------------------------------------------------------------- |
| 635 | |
| 636 | class MyApp : public wxApp |
| 637 | { |
| 638 | public: |
| 639 | virtual bool OnInit(); |
| 640 | }; |
| 641 | |
| 642 | |
| 643 | // ============================================================================ |
| 644 | // implementation |
| 645 | // ============================================================================ |
| 646 | |
| 647 | // ---------------------------------------------------------------------------- |
| 648 | // MyCanvas |
| 649 | // ---------------------------------------------------------------------------- |
| 650 | |
| 651 | const wxWindowID ID_ADDBUTTON = wxWindow::NewControlId(); |
| 652 | const wxWindowID ID_DELBUTTON = wxWindow::NewControlId(); |
| 653 | const wxWindowID ID_MOVEBUTTON = wxWindow::NewControlId(); |
| 654 | const wxWindowID ID_SCROLLWIN = wxWindow::NewControlId(); |
| 655 | const wxWindowID ID_QUERYPOS = wxWindow::NewControlId(); |
| 656 | |
| 657 | const wxWindowID ID_NEWBUTTON = wxWindow::NewControlId(); |
| 658 | |
| 659 | BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow) |
| 660 | EVT_PAINT( MyCanvas::OnPaint) |
| 661 | EVT_RIGHT_DOWN( MyCanvas::OnMouseRightDown) |
| 662 | EVT_MOUSEWHEEL( MyCanvas::OnMouseWheel) |
| 663 | EVT_BUTTON( ID_QUERYPOS, MyCanvas::OnQueryPosition) |
| 664 | EVT_BUTTON( ID_ADDBUTTON, MyCanvas::OnAddButton) |
| 665 | EVT_BUTTON( ID_DELBUTTON, MyCanvas::OnDeleteButton) |
| 666 | EVT_BUTTON( ID_MOVEBUTTON, MyCanvas::OnMoveButton) |
| 667 | EVT_BUTTON( ID_SCROLLWIN, MyCanvas::OnScrollWin) |
| 668 | END_EVENT_TABLE() |
| 669 | |
| 670 | MyCanvas::MyCanvas(wxWindow *parent) |
| 671 | : wxScrolledWindow(parent, wxID_ANY, |
| 672 | wxDefaultPosition, wxDefaultSize, |
| 673 | wxSUNKEN_BORDER | wxTAB_TRAVERSAL) |
| 674 | { |
| 675 | // you can use either a single SetScrollbars() call or these 2 functions, |
| 676 | // usually using them is better because you normally won't need to change |
| 677 | // the scroll rate in the future and the sizer can be used to update the |
| 678 | // virtual size automatically |
| 679 | SetScrollRate( 10, 10 ); |
| 680 | SetVirtualSize( 500, 1000 ); |
| 681 | |
| 682 | (void) new wxButton( this, ID_ADDBUTTON, "add button", wxPoint(10,10) ); |
| 683 | (void) new wxButton( this, ID_DELBUTTON, "del button", wxPoint(10,40) ); |
| 684 | (void) new wxButton( this, ID_MOVEBUTTON, "move button", wxPoint(150,10) ); |
| 685 | (void) new wxButton( this, ID_SCROLLWIN, "scroll win", wxPoint(250,10) ); |
| 686 | |
| 687 | wxPanel *test = new wxPanel( this, wxID_ANY, |
| 688 | wxPoint(10, 110), wxSize(130,50), |
| 689 | wxSIMPLE_BORDER | wxTAB_TRAVERSAL ); |
| 690 | test->SetBackgroundColour( "WHEAT" ); |
| 691 | |
| 692 | SetBackgroundColour( "BLUE" ); |
| 693 | } |
| 694 | |
| 695 | void MyCanvas::OnMouseRightDown( wxMouseEvent &event ) |
| 696 | { |
| 697 | wxPoint pt( event.GetPosition() ); |
| 698 | int x,y; |
| 699 | CalcUnscrolledPosition( pt.x, pt.y, &x, &y ); |
| 700 | wxLogMessage("Mouse down event at: %d %d, scrolled: %d %d", |
| 701 | pt.x, pt.y, x, y); |
| 702 | } |
| 703 | |
| 704 | void MyCanvas::OnMouseWheel( wxMouseEvent &event ) |
| 705 | { |
| 706 | wxPoint pt( event.GetPosition() ); |
| 707 | int x,y; |
| 708 | CalcUnscrolledPosition( pt.x, pt.y, &x, &y ); |
| 709 | wxLogMessage( "Mouse wheel event at: %d %d, scrolled: %d %d\n" |
| 710 | "Rotation: %d, delta = %d", |
| 711 | pt.x, pt.y, x, y, |
| 712 | event.GetWheelRotation(), event.GetWheelDelta() ); |
| 713 | |
| 714 | event.Skip(); |
| 715 | } |
| 716 | |
| 717 | void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) ) |
| 718 | { |
| 719 | wxPaintDC dc( this ); |
| 720 | PrepareDC( dc ); |
| 721 | |
| 722 | dc.DrawText( "Press right mouse button to test calculations!", 160, 50 ); |
| 723 | |
| 724 | dc.DrawText( "Some text", 140, 140 ); |
| 725 | |
| 726 | dc.DrawRectangle( 100, 160, 200, 200 ); |
| 727 | } |
| 728 | |
| 729 | void MyCanvas::OnQueryPosition( wxCommandEvent &WXUNUSED(event) ) |
| 730 | { |
| 731 | wxPoint pt( m_button->GetPosition() ); |
| 732 | wxLogMessage( "Position of \"Query position\" is %d %d", pt.x, pt.y ); |
| 733 | pt = ClientToScreen( pt ); |
| 734 | wxLogMessage("Position of \"Query position\" on screen is %d %d", |
| 735 | pt.x, pt.y); |
| 736 | } |
| 737 | |
| 738 | void MyCanvas::OnAddButton( wxCommandEvent &WXUNUSED(event) ) |
| 739 | { |
| 740 | wxLogMessage( "Inserting button at position 10,70..." ); |
| 741 | wxButton *button = new wxButton( this, ID_NEWBUTTON, "new button", |
| 742 | wxPoint(10,70), wxSize(80,25) ); |
| 743 | wxPoint pt( button->GetPosition() ); |
| 744 | wxLogMessage( "-> Position after inserting %d %d", pt.x, pt.y ); |
| 745 | } |
| 746 | |
| 747 | void MyCanvas::OnDeleteButton( wxCommandEvent &WXUNUSED(event) ) |
| 748 | { |
| 749 | wxLogMessage( "Deleting button inserted with \"Add button\"..." ); |
| 750 | wxWindow *win = FindWindow( ID_NEWBUTTON ); |
| 751 | if (win) |
| 752 | win->Destroy(); |
| 753 | else |
| 754 | wxLogMessage( "-> No window with id = ID_NEWBUTTON found." ); |
| 755 | } |
| 756 | |
| 757 | void MyCanvas::OnMoveButton( wxCommandEvent &event ) |
| 758 | { |
| 759 | wxLogMessage( "Moving button 10 pixels downward.." ); |
| 760 | wxWindow *win = FindWindow( event.GetId() ); |
| 761 | wxPoint pt( win->GetPosition() ); |
| 762 | wxLogMessage( "-> Position before move is %d %d", pt.x, pt.y ); |
| 763 | win->Move( wxDefaultCoord, pt.y + 10 ); |
| 764 | pt = win->GetPosition(); |
| 765 | wxLogMessage( "-> Position after move is %d %d", pt.x, pt.y ); |
| 766 | } |
| 767 | |
| 768 | void MyCanvas::OnScrollWin( wxCommandEvent &WXUNUSED(event) ) |
| 769 | { |
| 770 | wxLogMessage("Scrolling 2 units up.\n" |
| 771 | "The white square and the controls should move equally!"); |
| 772 | Scroll( wxDefaultCoord, GetViewStart().y+2 ); |
| 773 | } |
| 774 | |
| 775 | // ---------------------------------------------------------------------------- |
| 776 | // MySizerScrolledWindow |
| 777 | // ---------------------------------------------------------------------------- |
| 778 | |
| 779 | MySizerScrolledWindow::MySizerScrolledWindow(wxWindow *parent) |
| 780 | : wxScrolledWindow(parent) |
| 781 | { |
| 782 | SetBackgroundColour( "GREEN" ); |
| 783 | |
| 784 | // Set the rate we'd like for scrolling. |
| 785 | |
| 786 | SetScrollRate( 5, 5 ); |
| 787 | |
| 788 | // Populate a sizer with a 'resizing' button and some other static |
| 789 | // decoration |
| 790 | |
| 791 | wxFlexGridSizer *sizer = new wxFlexGridSizer(2); |
| 792 | |
| 793 | m_button = new wxButton( this, wxID_RESIZE_FRAME, "Press me", |
| 794 | wxDefaultPosition, SMALL_BUTTON ); |
| 795 | |
| 796 | sizer->Add(m_button, wxSizerFlags().Centre().Border(20)); |
| 797 | sizer->Add(new wxStaticText(this, wxID_ANY, "This is just"), |
| 798 | wxSizerFlags().Centre()); |
| 799 | sizer->Add(new wxStaticText(this, wxID_ANY, "some decoration"), |
| 800 | wxSizerFlags().Centre()); |
| 801 | sizer->Add(new wxStaticText(this, wxID_ANY, "for you to scroll..."), |
| 802 | wxSizerFlags().Centre()); |
| 803 | |
| 804 | // Then use the sizer to set the scrolled region size. |
| 805 | |
| 806 | SetSizer( sizer ); |
| 807 | |
| 808 | Connect(wxID_RESIZE_FRAME, wxEVT_COMMAND_BUTTON_CLICKED, |
| 809 | wxCommandEventHandler(MySizerScrolledWindow::OnResizeClick)); |
| 810 | } |
| 811 | |
| 812 | void MySizerScrolledWindow::OnResizeClick(wxCommandEvent &WXUNUSED(event)) |
| 813 | { |
| 814 | // Arbitrarily resize the button to change the minimum size of |
| 815 | // the (scrolled) sizer. |
| 816 | |
| 817 | if ( m_button->GetSize() == SMALL_BUTTON ) |
| 818 | m_button->SetSizeHints(LARGE_BUTTON); |
| 819 | else |
| 820 | m_button->SetSizeHints(SMALL_BUTTON); |
| 821 | |
| 822 | // Force update layout and scrollbars, since nothing we do here |
| 823 | // necessarily generates a size event which would do it for us. |
| 824 | FitInside(); |
| 825 | } |
| 826 | |
| 827 | // ---------------------------------------------------------------------------- |
| 828 | // MyFrame |
| 829 | // ---------------------------------------------------------------------------- |
| 830 | |
| 831 | const wxWindowID Scroll_Test_Simple = wxWindow::NewControlId(); |
| 832 | const wxWindowID Scroll_Test_Canvas = wxWindow::NewControlId(); |
| 833 | const wxWindowID Scroll_Test_Sizers = wxWindow::NewControlId(); |
| 834 | const wxWindowID Scroll_Test_Sub = wxWindow::NewControlId(); |
| 835 | const wxWindowID Scroll_Test_Auto = wxWindow::NewControlId(); |
| 836 | |
| 837 | const wxWindowID Scroll_TglBtn_Sync = wxWindow::NewControlId(); |
| 838 | const wxWindowID Scroll_Radio_ShowScrollbar = wxWindow::NewControlId(); |
| 839 | |
| 840 | BEGIN_EVENT_TABLE(MyFrame,wxFrame) |
| 841 | EVT_MENU(wxID_ABOUT, MyFrame::OnAbout) |
| 842 | EVT_MENU(wxID_EXIT, MyFrame::OnQuit) |
| 843 | |
| 844 | EVT_MENU(Scroll_Test_Simple, MyFrame::OnTestSimple) |
| 845 | EVT_MENU(Scroll_Test_Canvas, MyFrame::OnTestCanvas) |
| 846 | EVT_MENU(Scroll_Test_Sizers, MyFrame::OnTestSizer) |
| 847 | EVT_MENU(Scroll_Test_Sub, MyFrame::OnTestSub) |
| 848 | EVT_MENU(Scroll_Test_Auto, MyFrame::OnTestAuto) |
| 849 | |
| 850 | EVT_TOGGLEBUTTON(Scroll_TglBtn_Sync, MyFrame::OnToggleSync) |
| 851 | EVT_RADIOBOX(Scroll_Radio_ShowScrollbar, MyFrame::OnScrollbarVisibility) |
| 852 | END_EVENT_TABLE() |
| 853 | |
| 854 | MyFrame::MyFrame() |
| 855 | : wxFrame(NULL, wxID_ANY, "wxWidgets scroll sample") |
| 856 | { |
| 857 | wxMenu *menuFile = new wxMenu; |
| 858 | menuFile->Append(wxID_ABOUT, "&About.."); |
| 859 | menuFile->AppendSeparator(); |
| 860 | menuFile->Append(wxID_EXIT, "E&xit\tAlt-X"); |
| 861 | |
| 862 | wxMenu *menuTest = new wxMenu; |
| 863 | menuTest->Append(Scroll_Test_Simple, "&Simple scroll window\tF1", |
| 864 | "Simplest possible scrolled window test."); |
| 865 | menuTest->Append(Scroll_Test_Canvas, "Scrolled window with &children\tF2", |
| 866 | "Scrolled window with controls on it."); |
| 867 | menuTest->Append(Scroll_Test_Sizers, "Scrolled window with si&zer\tF3", |
| 868 | "Scrolled window with children managed by sizer."); |
| 869 | menuTest->Append(Scroll_Test_Sub, "Scrolled s&ub-window\tF4", |
| 870 | "Window only part of which is scrolled."); |
| 871 | menuTest->Append(Scroll_Test_Auto, "&Auto-scrolled window\tF5", |
| 872 | "Window which scrolls when the mouse is held pressed " |
| 873 | "outside of it."); |
| 874 | |
| 875 | wxMenuBar *mbar = new wxMenuBar; |
| 876 | mbar->Append(menuFile, "&File"); |
| 877 | mbar->Append(menuTest, "&Test"); |
| 878 | |
| 879 | SetMenuBar( mbar ); |
| 880 | |
| 881 | |
| 882 | wxPanel *panel = new wxPanel(this); |
| 883 | |
| 884 | const wxSizerFlags flagsExpand(wxSizerFlags(1).Expand()); |
| 885 | |
| 886 | wxSizer *topsizer = new wxBoxSizer(wxVERTICAL); |
| 887 | topsizer->Add(new wxStaticText(panel, wxID_ANY, |
| 888 | "The windows below should behave in the same way, even though\n" |
| 889 | "they're implemented quite differently, see the code for details.\n" |
| 890 | "\n" |
| 891 | "The lines redrawn during odd/even repaint iterations are drawn in\n" |
| 892 | "red/blue colour to allow seeing immediately how much is repainted,\n" |
| 893 | "don't be surprised by this."), |
| 894 | wxSizerFlags().Centre().Border()); |
| 895 | |
| 896 | m_win1 = new MyScrolledWindowDumb(panel); |
| 897 | m_win2 = new MyScrolledWindowSmart(panel); |
| 898 | |
| 899 | wxSizer *sizerScrollWin = new wxBoxSizer(wxHORIZONTAL); |
| 900 | sizerScrollWin->Add(m_win1, flagsExpand); |
| 901 | sizerScrollWin->Add(m_win2, flagsExpand); |
| 902 | topsizer->Add(sizerScrollWin, flagsExpand); |
| 903 | |
| 904 | const wxSizerFlags |
| 905 | flagsHBorder(wxSizerFlags().Centre().Border(wxLEFT | wxRIGHT)); |
| 906 | |
| 907 | wxSizer *sizerBtns = new wxBoxSizer(wxHORIZONTAL); |
| 908 | |
| 909 | // the radio buttons are in the same order as wxSHOW_SB_XXX values but |
| 910 | // offset by 1 |
| 911 | const wxString visibilities[] = { "&never", "&default", "&always" }; |
| 912 | wxRadioBox *radio = new wxRadioBox(panel, Scroll_Radio_ShowScrollbar, |
| 913 | "Left &scrollbar visibility: ", |
| 914 | wxDefaultPosition, wxDefaultSize, |
| 915 | WXSIZEOF(visibilities), visibilities); |
| 916 | radio->SetSelection(wxSHOW_SB_DEFAULT + 1); |
| 917 | sizerBtns->Add(radio, flagsHBorder); |
| 918 | |
| 919 | sizerBtns->Add(new wxToggleButton(panel, Scroll_TglBtn_Sync, "S&ynchronize"), |
| 920 | flagsHBorder); |
| 921 | |
| 922 | topsizer->Add(sizerBtns, wxSizerFlags().Centre().Border()); |
| 923 | |
| 924 | panel->SetSizer(topsizer); |
| 925 | |
| 926 | wxSize size = panel->GetBestSize(); |
| 927 | SetSizeHints(size); |
| 928 | SetClientSize(2*size); |
| 929 | |
| 930 | Show(); |
| 931 | } |
| 932 | |
| 933 | void MyFrame::OnToggleSync(wxCommandEvent& event) |
| 934 | { |
| 935 | if ( event.IsChecked() ) |
| 936 | { |
| 937 | m_win1->SyncWith(m_win2); |
| 938 | m_win2->SyncWith(m_win1); |
| 939 | } |
| 940 | else |
| 941 | { |
| 942 | m_win1->SyncWith(NULL); |
| 943 | m_win2->SyncWith(NULL); |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | void MyFrame::OnScrollbarVisibility(wxCommandEvent& event) |
| 948 | { |
| 949 | m_win1->ShowScrollbars(wxSHOW_SB_NEVER, |
| 950 | wxScrollbarVisibility(event.GetSelection() - 1)); |
| 951 | } |
| 952 | |
| 953 | void MyFrame::OnQuit(wxCommandEvent &WXUNUSED(event)) |
| 954 | { |
| 955 | Close(true); |
| 956 | } |
| 957 | |
| 958 | void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) ) |
| 959 | { |
| 960 | (void)wxMessageBox( "wxScrolledWindow sample\n" |
| 961 | "\n" |
| 962 | "Robert Roebling (c) 1998\n" |
| 963 | "Vadim Zeitlin (c) 2008\n" |
| 964 | "Autoscrolling examples\n" |
| 965 | "Ron Lee (c) 2002\n" |
| 966 | "Auto-timed-scrolling example\n" |
| 967 | "Matt Gregory (c) 2003\n", |
| 968 | "About wxWidgets scroll sample", |
| 969 | wxICON_INFORMATION | wxOK ); |
| 970 | } |
| 971 | |
| 972 | // ---------------------------------------------------------------------------- |
| 973 | // MyApp |
| 974 | // ---------------------------------------------------------------------------- |
| 975 | |
| 976 | IMPLEMENT_APP(MyApp) |
| 977 | |
| 978 | bool MyApp::OnInit() |
| 979 | { |
| 980 | if ( !wxApp::OnInit() ) |
| 981 | return false; |
| 982 | |
| 983 | new MyFrame(); |
| 984 | |
| 985 | return true; |
| 986 | } |
| 987 | |
| 988 | // ---------------------------------------------------------------------------- |
| 989 | // MyScrolledWindowXXX |
| 990 | // ---------------------------------------------------------------------------- |
| 991 | |
| 992 | void MyScrolledWindowDumb::OnDraw(wxDC& dc) |
| 993 | { |
| 994 | // this is useful to see which lines are redrawn |
| 995 | static size_t s_redrawCount = 0; |
| 996 | dc.SetTextForeground(s_redrawCount++ % 2 ? *wxRED : *wxBLUE); |
| 997 | |
| 998 | int y = 0; |
| 999 | for ( size_t line = 0; line < m_nLines; line++ ) |
| 1000 | { |
| 1001 | int yPhys; |
| 1002 | CalcScrolledPosition(0, y, NULL, &yPhys); |
| 1003 | |
| 1004 | dc.DrawText(wxString::Format("Line %u (logical %d, physical %d)", |
| 1005 | unsigned(line), y, yPhys), 0, y); |
| 1006 | y += m_hLine; |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | void MyScrolledWindowSmart::OnDraw(wxDC& dc) |
| 1011 | { |
| 1012 | // this is useful to see which lines are redrawn |
| 1013 | static size_t s_redrawCount = 0; |
| 1014 | dc.SetTextForeground(s_redrawCount++ % 2 ? *wxRED : *wxBLUE); |
| 1015 | |
| 1016 | // update region is always in device coords, translate to logical ones |
| 1017 | wxRect rectUpdate = GetUpdateRegion().GetBox(); |
| 1018 | CalcUnscrolledPosition(rectUpdate.x, rectUpdate.y, |
| 1019 | &rectUpdate.x, &rectUpdate.y); |
| 1020 | |
| 1021 | size_t lineFrom = rectUpdate.y / m_hLine, |
| 1022 | lineTo = rectUpdate.GetBottom() / m_hLine; |
| 1023 | |
| 1024 | if ( lineTo > m_nLines - 1) |
| 1025 | lineTo = m_nLines - 1; |
| 1026 | |
| 1027 | int y = lineFrom*m_hLine; |
| 1028 | for ( size_t line = lineFrom; line <= lineTo; line++ ) |
| 1029 | { |
| 1030 | int yPhys; |
| 1031 | CalcScrolledPosition(0, y, NULL, &yPhys); |
| 1032 | |
| 1033 | dc.DrawText(wxString::Format("Line %u (logical %d, physical %d)", |
| 1034 | unsigned(line), y, yPhys), 0, y); |
| 1035 | y += m_hLine; |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | // ---------------------------------------------------------------------------- |
| 1040 | // MyAutoScrollingWindow |
| 1041 | // ---------------------------------------------------------------------------- |
| 1042 | |
| 1043 | BEGIN_EVENT_TABLE(MyAutoScrollingWindow, wxScrolledWindow) |
| 1044 | EVT_LEFT_DOWN(MyAutoScrollingWindow::OnMouseLeftDown) |
| 1045 | EVT_LEFT_UP(MyAutoScrollingWindow::OnMouseLeftUp) |
| 1046 | EVT_MOTION(MyAutoScrollingWindow::OnMouseMove) |
| 1047 | EVT_MOUSE_CAPTURE_LOST(MyAutoScrollingWindow::OnMouseCaptureLost) |
| 1048 | EVT_SCROLLWIN(MyAutoScrollingWindow::OnScroll) |
| 1049 | END_EVENT_TABLE() |
| 1050 | |
| 1051 | MyAutoScrollingWindow::MyAutoScrollingWindow(wxWindow* parent) |
| 1052 | : wxScrolledWindow(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, |
| 1053 | wxVSCROLL | wxHSCROLL | wxSUNKEN_BORDER), |
| 1054 | m_selStart(-1, -1), |
| 1055 | m_cursor(-1, -1), |
| 1056 | m_font(9, wxFONTFAMILY_TELETYPE, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL) |
| 1057 | { |
| 1058 | wxClientDC dc(this); |
| 1059 | // query dc for text size |
| 1060 | dc.SetFont(m_font); |
| 1061 | dc.GetTextExtent(wxString("A"), &m_fontW, &m_fontH); |
| 1062 | // set up the virtual window |
| 1063 | SetScrollbars(m_fontW, m_fontH, sm_lineLen, sm_lineCnt); |
| 1064 | } |
| 1065 | |
| 1066 | wxRect |
| 1067 | MyAutoScrollingWindow::DeviceCoordsToGraphicalChars(wxRect updRect) const |
| 1068 | { |
| 1069 | wxPoint pos(updRect.GetPosition()); |
| 1070 | pos = DeviceCoordsToGraphicalChars(pos); |
| 1071 | updRect.x = pos.x; |
| 1072 | updRect.y = pos.y; |
| 1073 | updRect.width /= m_fontW; |
| 1074 | updRect.height /= m_fontH; |
| 1075 | // the *CoordsToGraphicalChars() funcs round down to upper-left corner, |
| 1076 | // so an off-by-one correction is needed |
| 1077 | ++updRect.width; // kludge |
| 1078 | ++updRect.height; // kludge |
| 1079 | return updRect; |
| 1080 | } |
| 1081 | |
| 1082 | wxPoint |
| 1083 | MyAutoScrollingWindow::DeviceCoordsToGraphicalChars(wxPoint pos) const |
| 1084 | { |
| 1085 | pos.x /= m_fontW; |
| 1086 | pos.y /= m_fontH; |
| 1087 | pos += GetViewStart(); |
| 1088 | return pos; |
| 1089 | } |
| 1090 | |
| 1091 | wxPoint |
| 1092 | MyAutoScrollingWindow::GraphicalCharToDeviceCoords(wxPoint pos) const |
| 1093 | { |
| 1094 | pos -= GetViewStart(); |
| 1095 | pos.x *= m_fontW; |
| 1096 | pos.y *= m_fontH; |
| 1097 | return pos; |
| 1098 | } |
| 1099 | |
| 1100 | wxRect |
| 1101 | MyAutoScrollingWindow::LogicalCoordsToGraphicalChars(wxRect updRect) const |
| 1102 | { |
| 1103 | wxPoint pos(updRect.GetPosition()); |
| 1104 | pos = LogicalCoordsToGraphicalChars(pos); |
| 1105 | updRect.x = pos.x; |
| 1106 | updRect.y = pos.y; |
| 1107 | updRect.width /= m_fontW; |
| 1108 | updRect.height /= m_fontH; |
| 1109 | // the *CoordsToGraphicalChars() funcs round down to upper-left corner, |
| 1110 | // so an off-by-one correction is needed |
| 1111 | ++updRect.width; // kludge |
| 1112 | ++updRect.height; // kludge |
| 1113 | return updRect; |
| 1114 | } |
| 1115 | |
| 1116 | wxPoint |
| 1117 | MyAutoScrollingWindow::LogicalCoordsToGraphicalChars(wxPoint pos) const |
| 1118 | { |
| 1119 | pos.x /= m_fontW; |
| 1120 | pos.y /= m_fontH; |
| 1121 | return pos; |
| 1122 | } |
| 1123 | |
| 1124 | wxPoint |
| 1125 | MyAutoScrollingWindow::GraphicalCharToLogicalCoords(wxPoint pos) const |
| 1126 | { |
| 1127 | pos.x *= m_fontW; |
| 1128 | pos.y *= m_fontH; |
| 1129 | return pos; |
| 1130 | } |
| 1131 | |
| 1132 | void MyAutoScrollingWindow::MyRefresh() |
| 1133 | { |
| 1134 | static wxPoint lastSelStart(-1, -1), lastCursor(-1, -1); |
| 1135 | // refresh last selected area (to deselect previously selected text) |
| 1136 | wxRect lastUpdRect( |
| 1137 | GraphicalCharToDeviceCoords(lastSelStart), |
| 1138 | GraphicalCharToDeviceCoords(lastCursor) |
| 1139 | ); |
| 1140 | // off-by-one corrections, necessary because it's not possible to know |
| 1141 | // when to round up until rect is normalized by lastUpdRect constructor |
| 1142 | lastUpdRect.width += m_fontW; // kludge |
| 1143 | lastUpdRect.height += m_fontH; // kludge |
| 1144 | // refresh currently selected (to select previously unselected text) |
| 1145 | wxRect updRect( |
| 1146 | GraphicalCharToDeviceCoords(m_selStart), |
| 1147 | GraphicalCharToDeviceCoords(m_cursor) |
| 1148 | ); |
| 1149 | // off-by-one corrections |
| 1150 | updRect.width += m_fontW; // kludge |
| 1151 | updRect.height += m_fontH; // kludge |
| 1152 | // find necessary refresh areas |
| 1153 | int rx = lastUpdRect.x; |
| 1154 | int ry = lastUpdRect.y; |
| 1155 | int rw = updRect.x - lastUpdRect.x; |
| 1156 | int rh = lastUpdRect.height; |
| 1157 | if (rw && rh) { |
| 1158 | RefreshRect(DCNormalize(rx, ry, rw, rh)); |
| 1159 | } |
| 1160 | rx = updRect.x; |
| 1161 | ry = updRect.y + updRect.height; |
| 1162 | rw= updRect.width; |
| 1163 | rh = (lastUpdRect.y + lastUpdRect.height) - (updRect.y + updRect.height); |
| 1164 | if (rw && rh) { |
| 1165 | RefreshRect(DCNormalize(rx, ry, rw, rh)); |
| 1166 | } |
| 1167 | rx = updRect.x + updRect.width; |
| 1168 | ry = lastUpdRect.y; |
| 1169 | rw = (lastUpdRect.x + lastUpdRect.width) - (updRect.x + updRect.width); |
| 1170 | rh = lastUpdRect.height; |
| 1171 | if (rw && rh) { |
| 1172 | RefreshRect(DCNormalize(rx, ry, rw, rh)); |
| 1173 | } |
| 1174 | rx = updRect.x; |
| 1175 | ry = lastUpdRect.y; |
| 1176 | rw = updRect.width; |
| 1177 | rh = updRect.y - lastUpdRect.y; |
| 1178 | if (rw && rh) { |
| 1179 | RefreshRect(DCNormalize(rx, ry, rw, rh)); |
| 1180 | } |
| 1181 | // update last |
| 1182 | lastSelStart = m_selStart; |
| 1183 | lastCursor = m_cursor; |
| 1184 | } |
| 1185 | |
| 1186 | bool MyAutoScrollingWindow::IsSelected(int chX, int chY) const |
| 1187 | { |
| 1188 | if (IsInside(chX, m_selStart.x, m_cursor.x) |
| 1189 | && IsInside(chY, m_selStart.y, m_cursor.y)) { |
| 1190 | return true; |
| 1191 | } |
| 1192 | return false; |
| 1193 | } |
| 1194 | |
| 1195 | bool MyAutoScrollingWindow::IsInside(int k, int bound1, int bound2) |
| 1196 | { |
| 1197 | if ((k >= bound1 && k <= bound2) || (k >= bound2 && k <= bound1)) { |
| 1198 | return true; |
| 1199 | } |
| 1200 | return false; |
| 1201 | } |
| 1202 | |
| 1203 | wxRect |
| 1204 | MyAutoScrollingWindow::DCNormalize(int x, int y, int w, int h) |
| 1205 | { |
| 1206 | // this is needed to get rid of the graphical remnants from the selection |
| 1207 | // I think it's because DrawRectangle() excludes a pixel in either direction |
| 1208 | const int kludge = 1; |
| 1209 | // make (x, y) the top-left corner |
| 1210 | if (w < 0) { |
| 1211 | w = -w + kludge; |
| 1212 | x -= w; |
| 1213 | } else { |
| 1214 | x -= kludge; |
| 1215 | w += kludge; |
| 1216 | } |
| 1217 | if (h < 0) { |
| 1218 | h = -h + kludge; |
| 1219 | y -= h; |
| 1220 | } else { |
| 1221 | y -= kludge; |
| 1222 | h += kludge; |
| 1223 | } |
| 1224 | return wxRect(x, y, w, h); |
| 1225 | } |
| 1226 | |
| 1227 | void MyAutoScrollingWindow::OnDraw(wxDC& dc) |
| 1228 | { |
| 1229 | dc.SetFont(m_font); |
| 1230 | wxBrush normBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW) |
| 1231 | , wxSOLID); |
| 1232 | wxBrush selBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHT) |
| 1233 | , wxSOLID); |
| 1234 | dc.SetPen(*wxTRANSPARENT_PEN); |
| 1235 | const wxString str = sm_testData; |
| 1236 | size_t strLength = str.length(); |
| 1237 | wxString::const_iterator str_i; |
| 1238 | |
| 1239 | // draw the characters |
| 1240 | // 1. for each update region |
| 1241 | for (wxRegionIterator upd(GetUpdateRegion()); upd; ++upd) { |
| 1242 | wxRect updRect = upd.GetRect(); |
| 1243 | wxRect updRectInGChars(DeviceCoordsToGraphicalChars(updRect)); |
| 1244 | // 2. for each row of chars in the update region |
| 1245 | for (int chY = updRectInGChars.y |
| 1246 | ; chY <= updRectInGChars.y + updRectInGChars.height; ++chY) { |
| 1247 | // 3. for each character in the row |
| 1248 | bool isFirstX = true; |
| 1249 | for (int chX = updRectInGChars.x |
| 1250 | ; chX <= updRectInGChars.x + updRectInGChars.width |
| 1251 | ; ++chX) { |
| 1252 | // 4. set up dc |
| 1253 | if (IsSelected(chX, chY)) { |
| 1254 | dc.SetBrush(selBrush); |
| 1255 | dc.SetTextForeground( wxSystemSettings::GetColour |
| 1256 | (wxSYS_COLOUR_HIGHLIGHTTEXT)); |
| 1257 | } else { |
| 1258 | dc.SetBrush(normBrush); |
| 1259 | dc.SetTextForeground( wxSystemSettings::GetColour |
| 1260 | (wxSYS_COLOUR_WINDOWTEXT)); |
| 1261 | } |
| 1262 | // 5. find position info |
| 1263 | wxPoint charPos = GraphicalCharToLogicalCoords(wxPoint |
| 1264 | (chX, chY)); |
| 1265 | // 6. draw! |
| 1266 | dc.DrawRectangle(charPos.x, charPos.y, m_fontW, m_fontH); |
| 1267 | size_t charIndex = chY * sm_lineLen + chX; |
| 1268 | if (chY < sm_lineCnt && |
| 1269 | chX < sm_lineLen && |
| 1270 | charIndex < strLength) |
| 1271 | { |
| 1272 | if (isFirstX) |
| 1273 | { |
| 1274 | str_i = str.begin() + charIndex; |
| 1275 | isFirstX = false; |
| 1276 | } |
| 1277 | dc.DrawText(*str_i, charPos.x, charPos.y); |
| 1278 | ++str_i; |
| 1279 | } |
| 1280 | } |
| 1281 | } |
| 1282 | } |
| 1283 | } |
| 1284 | |
| 1285 | void MyAutoScrollingWindow::OnMouseLeftDown(wxMouseEvent& event) |
| 1286 | { |
| 1287 | // initial press of mouse button sets the beginning of the selection |
| 1288 | m_selStart = DeviceCoordsToGraphicalChars(event.GetPosition()); |
| 1289 | // set the cursor to the same position |
| 1290 | m_cursor = m_selStart; |
| 1291 | // draw/erase selection |
| 1292 | MyRefresh(); |
| 1293 | } |
| 1294 | |
| 1295 | void MyAutoScrollingWindow::OnMouseLeftUp(wxMouseEvent& WXUNUSED(event)) |
| 1296 | { |
| 1297 | // this test is necessary |
| 1298 | if (HasCapture()) { |
| 1299 | // uncapture mouse |
| 1300 | ReleaseMouse(); |
| 1301 | } |
| 1302 | } |
| 1303 | |
| 1304 | void MyAutoScrollingWindow::OnMouseMove(wxMouseEvent& event) |
| 1305 | { |
| 1306 | // if user is dragging |
| 1307 | if (event.Dragging() && event.LeftIsDown()) { |
| 1308 | // set the new cursor position |
| 1309 | m_cursor = DeviceCoordsToGraphicalChars(event.GetPosition()); |
| 1310 | // draw/erase selection |
| 1311 | MyRefresh(); |
| 1312 | // capture mouse to activate auto-scrolling |
| 1313 | if (!HasCapture()) { |
| 1314 | CaptureMouse(); |
| 1315 | } |
| 1316 | } |
| 1317 | } |
| 1318 | |
| 1319 | void |
| 1320 | MyAutoScrollingWindow::OnMouseCaptureLost(wxMouseCaptureLostEvent& |
| 1321 | WXUNUSED(event)) |
| 1322 | { |
| 1323 | // we only capture mouse for timed scrolling, so nothing is needed here |
| 1324 | // other than making sure to not call event.Skip() |
| 1325 | } |
| 1326 | |
| 1327 | void MyAutoScrollingWindow::OnScroll(wxScrollWinEvent& event) |
| 1328 | { |
| 1329 | // need to move the cursor when autoscrolling |
| 1330 | // FIXME: the cursor also moves when the scrollbar arrows are clicked |
| 1331 | if (HasCapture()) { |
| 1332 | if (event.GetOrientation() == wxHORIZONTAL) { |
| 1333 | if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP) { |
| 1334 | --m_cursor.x; |
| 1335 | } else if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN) { |
| 1336 | ++m_cursor.x; |
| 1337 | } |
| 1338 | } else if (event.GetOrientation() == wxVERTICAL) { |
| 1339 | if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP) { |
| 1340 | --m_cursor.y; |
| 1341 | } else if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN) { |
| 1342 | ++m_cursor.y; |
| 1343 | } |
| 1344 | } |
| 1345 | } |
| 1346 | MyRefresh(); |
| 1347 | event.Skip(); |
| 1348 | } |
| 1349 | |
| 1350 | const int MyAutoScrollingWindow::sm_lineCnt = 125; |
| 1351 | const int MyAutoScrollingWindow::sm_lineLen = 79; |
| 1352 | const char *MyAutoScrollingWindow::sm_testData = |
| 1353 | "162 Cult of the genius out of vanity. Because we think well of ourselves, but " |
| 1354 | "nonetheless never suppose ourselves capable of producing a painting like one of " |
| 1355 | "Raphael's or a dramatic scene like one of Shakespeare's, we convince ourselves " |
| 1356 | "that the capacity to do so is quite extraordinarily marvelous, a wholly " |
| 1357 | "uncommon accident, or, if we are still religiously inclined, a mercy from on " |
| 1358 | "high. Thus our vanity, our self-love, promotes the cult of the genius: for only " |
| 1359 | "if we think of him as being very remote from us, as a miraculum, does he not " |
| 1360 | "aggrieve us (even Goethe, who was without envy, called Shakespeare his star of " |
| 1361 | "the most distant heights [\"William! Stern der schonsten Ferne\": from Goethe's, " |
| 1362 | "\"Between Two Worlds\"]; in regard to which one might recall the lines: \"the " |
| 1363 | "stars, these we do not desire\" [from Goethe's, \"Comfort in Tears\"]). But, aside " |
| 1364 | "from these suggestions of our vanity, the activity of the genius seems in no " |
| 1365 | "way fundamentally different from the activity of the inventor of machines, the " |
| 1366 | "scholar of astronomy or history, the master of tactics. All these activities " |
| 1367 | "are explicable if one pictures to oneself people whose thinking is active in " |
| 1368 | "one direction, who employ everything as material, who always zealously observe " |
| 1369 | "their own inner life and that of others, who perceive everywhere models and " |
| 1370 | "incentives, who never tire of combining together the means available to them. " |
| 1371 | "Genius too does nothing except learn first how to lay bricks then how to build, " |
| 1372 | "except continually seek for material and continually form itself around it. " |
| 1373 | "Every activity of man is amazingly complicated, not only that of the genius: " |
| 1374 | "but none is a \"miracle.\" Whence, then, the belief that genius exists only in " |
| 1375 | "the artist, orator and philosopher? that only they have \"intuition\"? (Whereby " |
| 1376 | "they are supposed to possess a kind of miraculous eyeglass with which they can " |
| 1377 | "see directly into \"the essence of the thing\"!) It is clear that people speak of " |
| 1378 | "genius only where the effects of the great intellect are most pleasant to them " |
| 1379 | "and where they have no desire to feel envious. To call someone \"divine\" means: " |
| 1380 | "\"here there is no need for us to compete.\" Then, everything finished and " |
| 1381 | "complete is regarded with admiration, everything still becoming is undervalued. " |
| 1382 | "But no one can see in the work of the artist how it has become; that is its " |
| 1383 | "advantage, for wherever one can see the act of becoming one grows somewhat " |
| 1384 | "cool. The finished and perfect art of representation repulses all thinking as " |
| 1385 | "to how it has become; it tyrannizes as present completeness and perfection. " |
| 1386 | "That is why the masters of the art of representation count above all as gifted " |
| 1387 | "with genius and why men of science do not. In reality, this evaluation of the " |
| 1388 | "former and undervaluation of the latter is only a piece of childishness in the " |
| 1389 | "realm of reason. " |
| 1390 | "\n\n" |
| 1391 | "163 The serious workman. Do not talk about giftedness, inborn talents! One can " |
| 1392 | "name great men of all kinds who were very little gifted. The acquired " |
| 1393 | "greatness, became \"geniuses\" (as we put it), through qualities the lack of " |
| 1394 | "which no one who knew what they were would boast of: they all possessed that " |
| 1395 | "seriousness of the efficient workman which first learns to construct the parts " |
| 1396 | "properly before it ventures to fashion a great whole; they allowed themselves " |
| 1397 | "time for it, because they took more pleasure in making the little, secondary " |
| 1398 | "things well than in the effect of a dazzling whole. the recipe for becoming a " |
| 1399 | "good novelist, for example, is easy to give, but to carry it out presupposes " |
| 1400 | "qualities one is accustomed to overlook when one says \"I do not have enough " |
| 1401 | "talent.\" One has only to make a hundred or so sketches for novels, none longer " |
| 1402 | "than two pages but of such distinctness that every word in them is necessary; " |
| 1403 | "one should write down anecdotes each day until one has learned how to give them " |
| 1404 | "the most pregnant and effective form; one should be tireless in collecting and " |
| 1405 | "describing human types and characters; one should above all relate things to " |
| 1406 | "others and listen to others relate, keeping one's eyes and ears open for the " |
| 1407 | "effect produced on those present, one should travel like a landscape painter or " |
| 1408 | "costume designer; one should excerpt for oneself out of the individual sciences " |
| 1409 | "everything that will produce an artistic effect when it is well described, one " |
| 1410 | "should, finally, reflect on the motives of human actions, disdain no signpost " |
| 1411 | "to instruction about them and be a collector of these things by day and night. " |
| 1412 | "One should continue in this many-sided exercise some ten years: what is then " |
| 1413 | "created in the workshop, however, will be fit to go out into the world. What, " |
| 1414 | "however, do most people do? They begin, not with the parts, but with the whole. " |
| 1415 | "Perhaps they chance to strike a right note, excite attention and from then on " |
| 1416 | "strike worse and worse notes, for good, natural reasons. Sometimes, when the " |
| 1417 | "character and intellect needed to formulate such a life-plan are lacking, fate " |
| 1418 | "and need take their place and lead the future master step by step through all " |
| 1419 | "the stipulations of his trade. " |
| 1420 | "\n\n" |
| 1421 | "164 Peril and profit in the cult of the genius. The belief in great, superior, " |
| 1422 | "fruitful spirits is not necessarily, yet nonetheless is very frequently " |
| 1423 | "associated with that religious or semi-religious superstition that these " |
| 1424 | "spirits are of supra-human origin and possess certain miraculous abilities by " |
| 1425 | "virtue of which they acquire their knowledge by quite other means than the rest " |
| 1426 | "of mankind. One ascribes to them, it seems, a direct view of the nature of the " |
| 1427 | "world, as it were a hole in the cloak of appearance, and believes that, by " |
| 1428 | "virtue of this miraculous seer's vision, they are able to communicate something " |
| 1429 | "conclusive and decisive about man and the world without the toil and " |
| 1430 | "rigorousness required by science. As long as there continue to be those who " |
| 1431 | "believe in the miraculous in the domain of knowledge one can perhaps concede " |
| 1432 | "that these people themselves derive some benefit from their belief, inasmuch as " |
| 1433 | "through their unconditional subjection to the great spirits they create for " |
| 1434 | "their own spirit during its time of development the finest form of discipline " |
| 1435 | "and schooling. On the other hand, it is at least questionable whether the " |
| 1436 | "superstitious belief in genius, in its privileges and special abilities, is of " |
| 1437 | "benefit to the genius himself if it takes root in him. It is in any event a " |
| 1438 | "dangerous sign when a man is assailed by awe of himself, whether it be the " |
| 1439 | "celebrated Caesar's awe of Caesar or the awe of one's own genius now under " |
| 1440 | "consideration; when the sacrificial incense which is properly rendered only to " |
| 1441 | "a god penetrates the brain of the genius, so that his head begins to swim and " |
| 1442 | "he comes to regard himself as something supra-human. The consequences that " |
| 1443 | "slowly result are: the feeling of irresponsibility, of exceptional rights, the " |
| 1444 | "belief that he confers a favor by his mere presence, insane rage when anyone " |
| 1445 | "attempts even to compare him with others, let alone to rate him beneath them, " |
| 1446 | "or to draw attention to lapses in his work. Because he ceases to practice " |
| 1447 | "criticism of himself, at last one pinion after the other falls out of his " |
| 1448 | "plumage: that superstitious eats at the roots of his powers and perhaps even " |
| 1449 | "turns him into a hypocrite after his powers have fled from him. For the great " |
| 1450 | "spirits themselves it is therefore probably more beneficial if they acquire an " |
| 1451 | "insight into the nature and origin of their powers, if they grasp, that is to " |
| 1452 | "say, what purely human qualities have come together in them and what fortunate " |
| 1453 | "circumstances attended them: in the first place undiminished energy, resolute " |
| 1454 | "application to individual goals, great personal courage, then the good fortune " |
| 1455 | "to receive an upbringing which offered in the early years the finest teachers, " |
| 1456 | "models and methods. To be sure, when their goal is the production of the " |
| 1457 | "greatest possible effect, unclarity with regard to oneself and that " |
| 1458 | "semi-insanity superadded to it has always achieved much; for what has been " |
| 1459 | "admired and envied at all times has been that power in them by virtue of which " |
| 1460 | "they render men will-less and sweep them away into the delusion that the " |
| 1461 | "leaders they are following are supra-natural. Indeed, it elevates and inspires " |
| 1462 | "men to believe that someone is in possession of supra-natural powers: to this " |
| 1463 | "extent Plato was right to say [Plato: Phaedrus, 244a] that madness has brought " |
| 1464 | "the greatest of blessings upon mankind. In rare individual cases this portion " |
| 1465 | "of madness may, indeed, actually have been the means by which such a nature, " |
| 1466 | "excessive in all directions, was held firmly together: in the life of " |
| 1467 | "individuals, too, illusions that are in themselves poisons often play the role " |
| 1468 | "of healers; yet, in the end, in the case of every \"genius\" who believes in his " |
| 1469 | "own divinity the poison shows itself to the same degree as his \"genius\" grows " |
| 1470 | "old: one may recall, for example, the case of Napoleon, whose nature certainly " |
| 1471 | "grew into the mighty unity that sets him apart from all men of modern times " |
| 1472 | "precisely through his belief in himself and his star and through the contempt " |
| 1473 | "for men that flowed from it; until in the end, however, this same belief went " |
| 1474 | "over into an almost insane fatalism, robbed him of his acuteness and swiftness " |
| 1475 | "of perception, and became the cause of his destruction."; |