-/*
- * Program: scroll
- *
- * Author: Robert Roebling
- *
- * Copyright: (C) 1998, Robert Roebling
- *
- */
-
-// For compilers that support precompilation, includes "wx/wx.h".
+/////////////////////////////////////////////////////////////////////////////
+// Name: scroll.cpp
+// Purpose: wxScrolled sample
+// Author: Robert Roebling
+// RCS-ID: $Id$
+// Copyright: (C) 1998 Robert Roebling, 2002 Ron Lee, 2003 Matt Gregory
+// (C) 2008 Vadim Zeitlin
+// Licence: wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
#include "wx/wxprec.h"
#ifdef __BORLANDC__
-#pragma hdrstop
+ #pragma hdrstop
#endif
#ifndef WX_PRECOMP
-#include "wx/wx.h"
+ #include "wx/wx.h"
+#endif
+
+#include "wx/sizer.h"
+#include "wx/log.h"
+#include "wx/tglbtn.h"
+
+#ifndef wxHAS_IMAGES_IN_RESOURCES
+ #include "../sample.xpm"
#endif
-#include "wx/image.h"
+// ----------------------------------------------------------------------------
+// a trivial example
+// ----------------------------------------------------------------------------
+
+// MySimpleCanvas: a scrolled window which draws a simple rectangle
+class MySimpleCanvas : public wxScrolled<wxWindow>
+{
+public:
+ enum
+ {
+ // these numbers are not multiple of 10 (our scroll step) to test for
+ // the absence of rounding errors (e.g. we should have one more page
+ // than WIDTH/10 to show the right side of the rectangle)
+ WIDTH = 292,
+ HEIGHT = 297
+ };
+
+ MySimpleCanvas(wxWindow *parent)
+ : wxScrolled<wxWindow>(parent, wxID_ANY)
+ {
+ SetScrollRate( 10, 10 );
+ SetVirtualSize( WIDTH, HEIGHT );
+ SetBackgroundColour( *wxWHITE );
+
+ Connect(wxEVT_PAINT, wxPaintEventHandler(MySimpleCanvas::OnPaint));
+ }
+
+private:
+ void OnPaint(wxPaintEvent& WXUNUSED(event))
+ {
+ wxPaintDC dc(this);
+
+ // this call is vital: it adjusts the dc to account for the current
+ // scroll offset
+ PrepareDC(dc);
+
+ dc.SetPen( *wxRED_PEN );
+ dc.SetBrush( *wxTRANSPARENT_BRUSH );
+ dc.DrawRectangle( 0, 0, WIDTH, HEIGHT );
+ }
+};
+
+
+// MySimpleFrame: a frame which contains a MySimpleCanvas
+class MySimpleFrame : public wxFrame
+{
+public:
+ MySimpleFrame(wxWindow *parent)
+ : wxFrame(parent, wxID_ANY, "MySimpleCanvas")
+ {
+ new MySimpleCanvas(this);
+
+ // ensure that we have scrollbars initially
+ SetClientSize(MySimpleCanvas::WIDTH/2, MySimpleCanvas::HEIGHT/2);
-// derived classes
+ Show();
+ }
+};
-class MyFrame;
-class MyApp;
+// ----------------------------------------------------------------------
+// a more complex example
+// ----------------------------------------------------------------------
// MyCanvas
+class MyCanvas : public wxScrolled<wxPanel>
+{
+public:
+ MyCanvas(wxWindow *parent);
+
+private:
+ void OnPaint(wxPaintEvent& event);
+ void OnQueryPosition(wxCommandEvent& event);
+ void OnAddButton(wxCommandEvent& event);
+ void OnDeleteButton(wxCommandEvent& event);
+ void OnMoveButton(wxCommandEvent& event);
+ void OnScrollWin(wxCommandEvent& event);
+ void OnMouseRightDown(wxMouseEvent& event);
+ void OnMouseWheel(wxMouseEvent& event);
+
+ wxButton *m_button;
+
+ DECLARE_EVENT_TABLE()
+};
+
+class MyCanvasFrame : public wxFrame
+{
+public:
+ MyCanvasFrame(wxWindow *parent)
+ : wxFrame(parent, wxID_ANY, "MyCanvas")
+ {
+ m_canvas = new MyCanvas(this);
+
+ wxMenu *menuFile = new wxMenu();
+ menuFile->Append(wxID_DELETE, "&Delete all");
+ menuFile->Append(wxID_NEW, "Insert &new");
+
+ wxMenuBar *mbar = new wxMenuBar();
+ mbar->Append(menuFile, "&File");
+ SetMenuBar( mbar );
+
+ Connect(wxID_DELETE, wxEVT_COMMAND_MENU_SELECTED,
+ wxCommandEventHandler(MyCanvasFrame::OnDeleteAll));
+ Connect(wxID_NEW, wxEVT_COMMAND_MENU_SELECTED,
+ wxCommandEventHandler(MyCanvasFrame::OnInsertNew));
+
+ Show();
+ }
+
+private:
+ void OnDeleteAll(wxCommandEvent& WXUNUSED(event))
+ {
+ m_canvas->DestroyChildren();
+ }
+
+ void OnInsertNew(wxCommandEvent& WXUNUSED(event))
+ {
+ (void)new wxButton(m_canvas, wxID_ANY, "Hello", wxPoint(100,100));
+ }
+
+ MyCanvas *m_canvas;
+};
+
+// ----------------------------------------------------------------------------
+// example using sizers with wxScrolled
+// ----------------------------------------------------------------------------
+
+const wxSize SMALL_BUTTON( 100, 50 );
+const wxSize LARGE_BUTTON( 300, 200 );
+
+class MySizerScrolledWindow : public wxScrolled<wxWindow>
+{
+public:
+ MySizerScrolledWindow(wxWindow *parent);
+
+private:
+ // this button can be clicked to change its own size in the handler below,
+ // the window size will be automatically adjusted to fit the button
+ wxButton *m_button;
+
+ void OnResizeClick(wxCommandEvent& event);
+};
+
+class MySizerFrame : public wxFrame
+{
+public:
+ MySizerFrame(wxWindow *parent)
+ : wxFrame(parent, wxID_ANY, "MySizerScrolledWindow")
+ {
+ new MySizerScrolledWindow(this);
+
+ // ensure that the scrollbars appear when the button becomes large
+ SetClientSize(LARGE_BUTTON/2);
+ Show();
+ }
+};
+
+// ----------------------------------------------------------------------------
+// example showing scrolling only part of the window
+// ----------------------------------------------------------------------------
+
+// this window consists of an empty space in its corner, column labels window
+// along its top, row labels window along its left hand side and a canvas in
+// the remaining space
+
+class MySubColLabels : public wxWindow
+{
+public:
+ MySubColLabels(wxScrolled<wxWindow> *parent)
+ : wxWindow(parent, wxID_ANY)
+ {
+ m_owner = parent;
+
+ Connect(wxEVT_PAINT, wxPaintEventHandler(MySubColLabels::OnPaint));
+ }
+
+private:
+ void OnPaint(wxPaintEvent& WXUNUSED(event))
+ {
+ wxPaintDC dc(this);
+
+ // This is wrong.. it will translate both x and y if the
+ // window is scrolled, the label windows are active in one
+ // direction only. Do the action below instead -- RL.
+ //m_owner->PrepareDC( dc );
+
+ int xScrollUnits, xOrigin;
+
+ m_owner->GetViewStart( &xOrigin, 0 );
+ m_owner->GetScrollPixelsPerUnit( &xScrollUnits, 0 );
+ dc.SetDeviceOrigin( -xOrigin * xScrollUnits, 0 );
+
+ dc.DrawText("Column 1", 5, 5);
+ dc.DrawText("Column 2", 105, 5);
+ dc.DrawText("Column 3", 205, 5);
+ }
+
+ wxScrolled<wxWindow> *m_owner;
+};
+
+class MySubRowLabels : public wxWindow
+{
+public:
+ MySubRowLabels(wxScrolled<wxWindow> *parent)
+ : wxWindow(parent, wxID_ANY)
+ {
+ m_owner = parent;
+
+ Connect(wxEVT_PAINT, wxPaintEventHandler(MySubRowLabels::OnPaint));
+ }
+
+private:
+ void OnPaint(wxPaintEvent& WXUNUSED(event))
+ {
+ wxPaintDC dc(this);
+
+ // This is wrong.. it will translate both x and y if the
+ // window is scrolled, the label windows are active in one
+ // direction only. Do the action below instead -- RL.
+ //m_owner->PrepareDC( dc );
+
+ int yScrollUnits, yOrigin;
+
+ m_owner->GetViewStart( 0, &yOrigin );
+ m_owner->GetScrollPixelsPerUnit( 0, &yScrollUnits );
+ dc.SetDeviceOrigin( 0, -yOrigin * yScrollUnits );
+
+ dc.DrawText("Row 1", 5, 5);
+ dc.DrawText("Row 2", 5, 30);
+ dc.DrawText("Row 3", 5, 55);
+ dc.DrawText("Row 4", 5, 80);
+ dc.DrawText("Row 5", 5, 105);
+ dc.DrawText("Row 6", 5, 130);
+ }
+
+ wxScrolled<wxWindow> *m_owner;
+};
+
+class MySubCanvas : public wxPanel
+{
+public:
+ MySubCanvas(wxScrolled<wxWindow> *parent, wxWindow *cols, wxWindow *rows)
+ : wxPanel(parent, wxID_ANY)
+ {
+ m_owner = parent;
+ m_colLabels = cols;
+ m_rowLabels = rows;
+
+ (void)new wxButton(this, wxID_ANY, "Hallo I",
+ wxPoint(0,50), wxSize(100,25) );
+ (void)new wxButton(this, wxID_ANY, "Hallo II",
+ wxPoint(200,50), wxSize(100,25) );
+
+ (void)new wxTextCtrl(this, wxID_ANY, "Text I",
+ wxPoint(0,100), wxSize(100,25) );
+ (void)new wxTextCtrl(this, wxID_ANY, "Text II",
+ wxPoint(200,100), wxSize(100,25) );
+
+ (void)new wxComboBox(this, wxID_ANY, "ComboBox I",
+ wxPoint(0,150), wxSize(100,25));
+ (void)new wxComboBox(this, wxID_ANY, "ComboBox II",
+ wxPoint(200,150), wxSize(100,25));
+
+ SetBackgroundColour("WHEAT");
+
+ Connect(wxEVT_PAINT, wxPaintEventHandler(MySubCanvas::OnPaint));
+ }
+
+ // override the base class function so that when this window is scrolled,
+ // the labels are scrolled in sync
+ virtual void ScrollWindow(int dx, int dy, const wxRect *rect)
+ {
+ wxPanel::ScrollWindow( dx, dy, rect );
+ m_colLabels->ScrollWindow( dx, 0, rect );
+ m_rowLabels->ScrollWindow( 0, dy, rect );
+ }
+
+private:
+ void OnPaint(wxPaintEvent& WXUNUSED(event))
+ {
+ wxPaintDC dc( this );
+ m_owner->PrepareDC( dc );
+
+ dc.SetPen( *wxBLACK_PEN );
+
+ // OK, let's assume we are a grid control and we have two
+ // grid cells. Here in OnPaint we want to know which cell
+ // to redraw so that we prevent redrawing cells that don't
+ // need to get redrawn. We have one cell at (0,0) and one
+ // more at (200,0), both having a size of (100,25).
+
+ // We can query how much the window has been scrolled
+ // by calling CalcUnscrolledPosition()
+
+ int scroll_x = 0;
+ int scroll_y = 0;
+ m_owner->CalcUnscrolledPosition( scroll_x, scroll_y, &scroll_x, &scroll_y );
+
+ // We also need to know the size of the window to see which
+ // cells are completely hidden and not get redrawn
+
+ int size_x = 0;
+ int size_y = 0;
+ GetClientSize( &size_x, &size_y );
+
+ // First cell: (0,0)(100,25)
+ // It it on screen?
+ if ((0+100-scroll_x > 0) && (0+25-scroll_y > 0) &&
+ (0-scroll_x < size_x) && (0-scroll_y < size_y))
+ {
+ // Has the region on screen been exposed?
+ if (IsExposed(0,0,100,25))
+ {
+ dc.DrawRectangle( 0, 0, 100, 25 );
+ dc.DrawText("First Cell", 5, 5);
+ }
+ }
+
+
+ // Second cell: (0,200)(100,25)
+ // It it on screen?
+ if ((200+100-scroll_x > 0) && (0+25-scroll_y > 0) &&
+ (200-scroll_x < size_x) && (0-scroll_y < size_y))
+ {
+ // Has the region on screen been exposed?
+ if (IsExposed(200,0,100,25))
+ {
+ dc.DrawRectangle( 200, 0, 100, 25 );
+ dc.DrawText("Second Cell", 205, 5);
+ }
+ }
+ }
+
+ wxScrolled<wxWindow> *m_owner;
+ wxWindow *m_colLabels,
+ *m_rowLabels;
+};
+
+class MySubScrolledWindow : public wxScrolled<wxWindow>
+{
+public:
+ enum
+ {
+ CORNER_WIDTH = 60,
+ CORNER_HEIGHT = 25
+ };
+
+ MySubScrolledWindow(wxWindow *parent)
+ : wxScrolled<wxWindow>(parent, wxID_ANY)
+ {
+ // create the children
+ MySubColLabels *cols = new MySubColLabels(this);
+ MySubRowLabels *rows = new MySubRowLabels(this);
+
+ m_canvas = new MySubCanvas(this, cols, rows);
+
+ // lay them out
+ wxFlexGridSizer *sizer = new wxFlexGridSizer(2, 2, 10, 10);
+ sizer->Add(CORNER_WIDTH, CORNER_HEIGHT); // just a spacer
+ sizer->Add(cols, wxSizerFlags().Expand());
+ sizer->Add(rows, wxSizerFlags().Expand());
+ sizer->Add(m_canvas, wxSizerFlags().Expand());
+ sizer->AddGrowableRow(1);
+ sizer->AddGrowableCol(1);
+ SetSizer(sizer);
+
+ // this is the key call: it means that only m_canvas will be scrolled
+ // and not this window itself
+ SetTargetWindow(m_canvas);
+
+ SetScrollbars(10, 10, 50, 50);
+
+ Connect(wxEVT_SIZE, wxSizeEventHandler(MySubScrolledWindow::OnSize));
+ }
+
+protected:
+ // scrolled windows which use scroll target different from the window
+ // itself must override this virtual method
+ virtual wxSize GetSizeAvailableForScrollTarget(const wxSize& size)
+ {
+ // decrease the total size by the size of the non-scrollable parts
+ // above/to the left of the canvas
+ wxSize sizeCanvas(size);
+ sizeCanvas.x -= 60;
+ sizeCanvas.y -= 25;
+ return sizeCanvas;
+ }
+
+private:
+ void OnSize(wxSizeEvent& WXUNUSED(event))
+ {
+ // We need to override OnSize so that our scrolled
+ // window a) does call Layout() to use sizers for
+ // positioning the controls but b) does not query
+ // the sizer for their size and use that for setting
+ // the scrollable area as set that ourselves by
+ // calling SetScrollbar() further down.
+
+ Layout();
+
+ AdjustScrollbars();
+ }
+
+ MySubCanvas *m_canvas;
+};
+
+class MySubFrame : public wxFrame
+{
+public:
+ MySubFrame(wxWindow *parent)
+ : wxFrame(parent, wxID_ANY, "MySubScrolledWindow")
+ {
+ new MySubScrolledWindow(this);
+
+ Show();
+ }
+};
+
+// ----------------------------------------------------------------------------
+// more simple examples of wxScrolled usage
+// ----------------------------------------------------------------------------
+
+// base class for both of them
+class MyScrolledWindowBase : public wxScrolled<wxWindow>
+{
+public:
+ MyScrolledWindowBase(wxWindow *parent)
+ : wxScrolled<wxWindow>(parent, wxID_ANY,
+ wxDefaultPosition, wxDefaultSize,
+ wxBORDER_SUNKEN)
+ {
+ m_nLines = 50;
+ m_winSync = NULL;
+ m_inDoSync = false;
+
+ wxClientDC dc(this);
+ dc.GetTextExtent("Line 17", NULL, &m_hLine);
+ }
+
+ // this scrolled window can be synchronized with another one: if this
+ // function is called with a non-NULL pointer, the given window will be
+ // scrolled to the same position as this one
+ void SyncWith(MyScrolledWindowBase *win)
+ {
+ m_winSync = win;
+
+ DoSyncIfNecessary();
+ }
+
+ virtual void ScrollWindow(int dx, int dy, const wxRect *rect = NULL)
+ {
+ wxScrolled<wxWindow>::ScrollWindow(dx, dy, rect);
+
+ DoSyncIfNecessary();
+ }
+
+protected:
+ // the height of one line on screen
+ int m_hLine;
+
+ // the number of lines we draw
+ size_t m_nLines;
+
+private:
+ bool WasScrolledFirst() const { return m_inDoSync; }
+
+ void DoSyncIfNecessary()
+ {
+ if ( m_winSync && !m_winSync->WasScrolledFirst() )
+ {
+ m_inDoSync = true;
+
+ m_winSync->Scroll(GetViewStart());
+
+ m_inDoSync = false;
+ }
+ }
+
+ // the window to synchronize with this one or NULL
+ MyScrolledWindowBase *m_winSync;
+
+ // the flag preventing infinite recursion which would otherwise happen if
+ // one window synchronized the other one which in turn synchronized this
+ // one and so on
+ bool m_inDoSync;
+};
+
+// this class does "stupid" redrawing - it redraws everything each time
+// and sets the scrollbar extent directly.
+
+class MyScrolledWindowDumb : public MyScrolledWindowBase
+{
+public:
+ MyScrolledWindowDumb(wxWindow *parent) : MyScrolledWindowBase(parent)
+ {
+ // no horz scrolling
+ SetScrollbars(0, m_hLine, 0, m_nLines + 1, 0, 0, true /* no refresh */);
+ }
+
+ virtual void OnDraw(wxDC& dc);
+};
+
+// this class does "smart" redrawing - only redraws the lines which must be
+// redrawn and sets the scroll rate and virtual size to affect the
+// scrollbars.
+//
+// Note that this class should produce identical results to the one above.
-class MyCanvas: public wxScrolledWindow
+class MyScrolledWindowSmart : public MyScrolledWindowBase
{
public:
- MyCanvas() {};
- MyCanvas( wxWindow *parent, wxWindowID, const wxPoint &pos, const wxSize &size );
- ~MyCanvas();
- void OnPaint( wxPaintEvent &event );
+ MyScrolledWindowSmart(wxWindow *parent) : MyScrolledWindowBase(parent)
+ {
+ // no horz scrolling
+ SetScrollRate( 0, m_hLine );
+ SetVirtualSize( wxDefaultCoord, ( m_nLines + 1 ) * m_hLine );
+ }
+
+ virtual void OnDraw(wxDC& dc);
+};
+
+// ----------------------------------------------------------------------------
+// implements a text viewer with simple block selection to test auto-scrolling
+// functionality
+// ----------------------------------------------------------------------------
+
+class MyAutoScrollingWindow : public wxScrolled<wxWindow>
+{
+public:
+ MyAutoScrollingWindow( wxWindow* parent );
+ wxRect DeviceCoordsToGraphicalChars(wxRect updRect) const;
+ wxPoint DeviceCoordsToGraphicalChars(wxPoint pos) const;
+ wxPoint GraphicalCharToDeviceCoords(wxPoint pos) const;
+ wxRect LogicalCoordsToGraphicalChars(wxRect updRect) const;
+ wxPoint LogicalCoordsToGraphicalChars(wxPoint pos) const;
+ wxPoint GraphicalCharToLogicalCoords(wxPoint pos) const;
+ void MyRefresh();
+ bool IsSelected(int chX, int chY) const;
+ static bool IsInside(int k, int bound1, int bound2);
+ static wxRect DCNormalize(int x, int y, int w, int h);
+
+private:
+ // event handlers
+ void OnDraw(wxDC& dc);
+ void OnMouseLeftDown(wxMouseEvent& event);
+ void OnMouseLeftUp(wxMouseEvent& event);
+ void OnMouseMove(wxMouseEvent& event);
+ void OnMouseCaptureLost(wxMouseCaptureLostEvent& event);
+ void OnScroll(wxScrollWinEvent& event);
+
+ // test data variables
+ static const char* sm_testData;
+ static const int sm_lineCnt; // line count
+ static const int sm_lineLen; // line length in characters
+ // sizes for graphical data
+ int m_fontH, m_fontW;
+ // selection tracking
+ wxPoint m_selStart; // beginning of blockwise selection
+ wxPoint m_cursor; // end of blockwise selection (mouse position)
+
+ // gui stuff
+ wxFont m_font;
+
- DECLARE_DYNAMIC_CLASS(MyCanvas)
DECLARE_EVENT_TABLE()
};
-// MyFrame
+class MyAutoFrame : public wxFrame
+{
+public:
+ MyAutoFrame(wxWindow *parent)
+ : wxFrame(parent, wxID_ANY, "MyAutoScrollingWindow")
+ {
+ new MyAutoScrollingWindow(this);
+
+ Show();
+ }
+};
+
+
+// ----------------------------------------------------------------------------
+// MyFrame: the main application frame showing all the classes above
+// ----------------------------------------------------------------------------
class MyFrame: public wxFrame
{
public:
MyFrame();
- void OnAbout( wxCommandEvent &event );
- void OnQuit( wxCommandEvent &event );
+private:
+ void OnAbout(wxCommandEvent& event);
+ void OnQuit(wxCommandEvent& event);
- MyCanvas *m_canvas;
+ void OnTestSimple(wxCommandEvent& WXUNUSED(event)) { new MySimpleFrame(this); }
+ void OnTestCanvas(wxCommandEvent& WXUNUSED(event)) { new MyCanvasFrame(this); }
+ void OnTestSizer(wxCommandEvent& WXUNUSED(event)) { new MySizerFrame(this); }
+ void OnTestSub(wxCommandEvent& WXUNUSED(event)) { new MySubFrame(this); }
+ void OnTestAuto(wxCommandEvent& WXUNUSED(event)) { new MyAutoFrame(this); }
+
+ void OnToggleSync(wxCommandEvent& event);
+ void OnScrollbarVisibility(wxCommandEvent& event);
+
+ MyScrolledWindowBase *m_win1,
+ *m_win2;
- DECLARE_DYNAMIC_CLASS(MyFrame)
DECLARE_EVENT_TABLE()
};
+// ----------------------------------------------------------------------------
// MyApp
+// ----------------------------------------------------------------------------
-class MyApp: public wxApp
+class MyApp : public wxApp
{
public:
virtual bool OnInit();
};
-// main program
-IMPLEMENT_APP(MyApp)
+// ============================================================================
+// implementation
+// ============================================================================
+// ----------------------------------------------------------------------------
// MyCanvas
+// ----------------------------------------------------------------------------
-IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
+const wxWindowIDRef ID_ADDBUTTON = wxWindow::NewControlId();
+const wxWindowIDRef ID_DELBUTTON = wxWindow::NewControlId();
+const wxWindowIDRef ID_MOVEBUTTON = wxWindow::NewControlId();
+const wxWindowIDRef ID_SCROLLWIN = wxWindow::NewControlId();
+const wxWindowIDRef ID_QUERYPOS = wxWindow::NewControlId();
-BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
- EVT_PAINT(MyCanvas::OnPaint)
+const wxWindowIDRef ID_NEWBUTTON = wxWindow::NewControlId();
+
+BEGIN_EVENT_TABLE(MyCanvas, wxScrolled<wxPanel>)
+ EVT_PAINT( MyCanvas::OnPaint)
+ EVT_RIGHT_DOWN( MyCanvas::OnMouseRightDown)
+ EVT_MOUSEWHEEL( MyCanvas::OnMouseWheel)
+ EVT_BUTTON( ID_QUERYPOS, MyCanvas::OnQueryPosition)
+ EVT_BUTTON( ID_ADDBUTTON, MyCanvas::OnAddButton)
+ EVT_BUTTON( ID_DELBUTTON, MyCanvas::OnDeleteButton)
+ EVT_BUTTON( ID_MOVEBUTTON, MyCanvas::OnMoveButton)
+ EVT_BUTTON( ID_SCROLLWIN, MyCanvas::OnScrollWin)
END_EVENT_TABLE()
-MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
- const wxPoint &pos, const wxSize &size )
- : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER )
+MyCanvas::MyCanvas(wxWindow *parent)
+ : wxScrolled<wxPanel>(parent, wxID_ANY,
+ wxDefaultPosition, wxDefaultSize,
+ wxSUNKEN_BORDER | wxTAB_TRAVERSAL)
{
+ // you can use either a single SetScrollbars() call or these 2 functions,
+ // usually using them is better because you normally won't need to change
+ // the scroll rate in the future and the sizer can be used to update the
+ // virtual size automatically
+ SetScrollRate( 10, 10 );
+ SetVirtualSize( 500, 1000 );
-// (void) new wxButton( this, -1, "wxButton", wxPoint(10,10) );
-
-// (void) new wxTextCtrl( this, -1, "wxTextCtrl", wxPoint(10,50) );
-
- (void) new wxRadioButton( this, -1, "Disable", wxPoint(10,90) );
-
- wxString choices[] =
- {
- "This",
- "is one of my",
- "really",
- "wonderful",
- "examples."
- };
-
-// (void) new wxComboBox( this, -1, "This", wxPoint(10,130), wxDefaultSize, 5, choices );
-
-// (void) new wxRadioBox( this, -1, "This", wxPoint(10,200), wxDefaultSize, 5, choices );
+ (void) new wxButton( this, ID_ADDBUTTON, "add button", wxPoint(10,10) );
+ (void) new wxButton( this, ID_DELBUTTON, "del button", wxPoint(10,40) );
+ (void) new wxButton( this, ID_MOVEBUTTON, "move button", wxPoint(150,10) );
+ (void) new wxButton( this, ID_SCROLLWIN, "scroll win", wxPoint(250,10) );
+
+ wxPanel *test = new wxPanel( this, wxID_ANY,
+ wxPoint(10, 110), wxSize(130,50),
+ wxSIMPLE_BORDER | wxTAB_TRAVERSAL );
+ test->SetBackgroundColour( "WHEAT" );
+
+ SetBackgroundColour( "BLUE" );
}
-MyCanvas::~MyCanvas()
+void MyCanvas::OnMouseRightDown( wxMouseEvent &event )
{
+ wxPoint pt( event.GetPosition() );
+ int x,y;
+ CalcUnscrolledPosition( pt.x, pt.y, &x, &y );
+ wxLogMessage("Mouse down event at: %d %d, scrolled: %d %d",
+ pt.x, pt.y, x, y);
+}
+
+void MyCanvas::OnMouseWheel( wxMouseEvent &event )
+{
+ wxPoint pt( event.GetPosition() );
+ int x,y;
+ CalcUnscrolledPosition( pt.x, pt.y, &x, &y );
+ wxLogMessage( "Mouse wheel event at: %d %d, scrolled: %d %d\n"
+ "Rotation: %d, delta = %d",
+ pt.x, pt.y, x, y,
+ event.GetWheelRotation(), event.GetWheelDelta() );
+
+ event.Skip();
}
void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
- return;
+ wxPaintDC dc( this );
+ PrepareDC( dc );
+
+ dc.DrawText( "Press right mouse button to test calculations!", 160, 50 );
+
+ dc.DrawText( "Some text", 140, 140 );
+
+ dc.DrawRectangle( 100, 160, 200, 200 );
+}
- wxPaintDC dc( this );
- PrepareDC( dc );
+void MyCanvas::OnQueryPosition( wxCommandEvent &WXUNUSED(event) )
+{
+ wxPoint pt( m_button->GetPosition() );
+ wxLogMessage( "Position of \"Query position\" is %d %d", pt.x, pt.y );
+ pt = ClientToScreen( pt );
+ wxLogMessage("Position of \"Query position\" on screen is %d %d",
+ pt.x, pt.y);
+}
- dc.DrawText( "Some text", 10, 10 );
-
- dc.DrawRectangle( 50, 30, 200, 200 );
+void MyCanvas::OnAddButton( wxCommandEvent &WXUNUSED(event) )
+{
+ wxLogMessage( "Inserting button at position 10,70..." );
+ wxButton *button = new wxButton( this, ID_NEWBUTTON, "new button",
+ wxPoint(10,70), wxSize(80,25) );
+ wxPoint pt( button->GetPosition() );
+ wxLogMessage( "-> Position after inserting %d %d", pt.x, pt.y );
}
+void MyCanvas::OnDeleteButton( wxCommandEvent &WXUNUSED(event) )
+{
+ wxLogMessage( "Deleting button inserted with \"Add button\"..." );
+ wxWindow *win = FindWindow( ID_NEWBUTTON );
+ if (win)
+ win->Destroy();
+ else
+ wxLogMessage( "-> No window with id = ID_NEWBUTTON found." );
+}
+
+void MyCanvas::OnMoveButton( wxCommandEvent &event )
+{
+ wxLogMessage( "Moving button 10 pixels downward.." );
+ wxWindow *win = FindWindow( event.GetId() );
+ wxPoint pt( win->GetPosition() );
+ wxLogMessage( "-> Position before move is %d %d", pt.x, pt.y );
+ win->Move( wxDefaultCoord, pt.y + 10 );
+ pt = win->GetPosition();
+ wxLogMessage( "-> Position after move is %d %d", pt.x, pt.y );
+}
+
+void MyCanvas::OnScrollWin( wxCommandEvent &WXUNUSED(event) )
+{
+ wxLogMessage("Scrolling 2 units up.\n"
+ "The white square and the controls should move equally!");
+ Scroll( wxDefaultCoord, GetViewStart().y+2 );
+}
+
+// ----------------------------------------------------------------------------
+// MySizerScrolledWindow
+// ----------------------------------------------------------------------------
+
+MySizerScrolledWindow::MySizerScrolledWindow(wxWindow *parent)
+ : wxScrolled<wxWindow>(parent)
+{
+ SetBackgroundColour( "GREEN" );
+
+ // Set the rate we'd like for scrolling.
+
+ SetScrollRate( 5, 5 );
+
+ // Populate a sizer with a 'resizing' button and some other static
+ // decoration
+
+ wxFlexGridSizer *sizer = new wxFlexGridSizer(2);
+
+ m_button = new wxButton( this, wxID_RESIZE_FRAME, "Press me",
+ wxDefaultPosition, SMALL_BUTTON );
+
+ sizer->Add(m_button, wxSizerFlags().Centre().Border(20));
+ sizer->Add(new wxStaticText(this, wxID_ANY, "This is just"),
+ wxSizerFlags().Centre());
+ sizer->Add(new wxStaticText(this, wxID_ANY, "some decoration"),
+ wxSizerFlags().Centre());
+ sizer->Add(new wxStaticText(this, wxID_ANY, "for you to scroll..."),
+ wxSizerFlags().Centre());
+
+ // Then use the sizer to set the scrolled region size.
+
+ SetSizer( sizer );
+
+ Connect(wxID_RESIZE_FRAME, wxEVT_COMMAND_BUTTON_CLICKED,
+ wxCommandEventHandler(MySizerScrolledWindow::OnResizeClick));
+}
+
+void MySizerScrolledWindow::OnResizeClick(wxCommandEvent &WXUNUSED(event))
+{
+ // Arbitrarily resize the button to change the minimum size of
+ // the (scrolled) sizer.
+
+ if ( m_button->GetSize() == SMALL_BUTTON )
+ m_button->SetSizeHints(LARGE_BUTTON);
+ else
+ m_button->SetSizeHints(SMALL_BUTTON);
+
+ // Force update layout and scrollbars, since nothing we do here
+ // necessarily generates a size event which would do it for us.
+ FitInside();
+}
+
+// ----------------------------------------------------------------------------
// MyFrame
+// ----------------------------------------------------------------------------
-const int ID_QUIT = 108;
-const int ID_ABOUT = 109;
+const wxWindowID Scroll_Test_Simple = wxWindow::NewControlId();
+const wxWindowID Scroll_Test_Canvas = wxWindow::NewControlId();
+const wxWindowID Scroll_Test_Sizers = wxWindow::NewControlId();
+const wxWindowID Scroll_Test_Sub = wxWindow::NewControlId();
+const wxWindowID Scroll_Test_Auto = wxWindow::NewControlId();
-IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
+const wxWindowID Scroll_TglBtn_Sync = wxWindow::NewControlId();
+const wxWindowID Scroll_Radio_ShowScrollbar = wxWindow::NewControlId();
BEGIN_EVENT_TABLE(MyFrame,wxFrame)
- EVT_MENU (ID_ABOUT, MyFrame::OnAbout)
- EVT_MENU (ID_QUIT, MyFrame::OnQuit)
+ EVT_MENU(wxID_ABOUT, MyFrame::OnAbout)
+ EVT_MENU(wxID_EXIT, MyFrame::OnQuit)
+
+ EVT_MENU(Scroll_Test_Simple, MyFrame::OnTestSimple)
+ EVT_MENU(Scroll_Test_Canvas, MyFrame::OnTestCanvas)
+ EVT_MENU(Scroll_Test_Sizers, MyFrame::OnTestSizer)
+ EVT_MENU(Scroll_Test_Sub, MyFrame::OnTestSub)
+ EVT_MENU(Scroll_Test_Auto, MyFrame::OnTestAuto)
+
+ EVT_TOGGLEBUTTON(Scroll_TglBtn_Sync, MyFrame::OnToggleSync)
+ EVT_RADIOBOX(Scroll_Radio_ShowScrollbar, MyFrame::OnScrollbarVisibility)
END_EVENT_TABLE()
MyFrame::MyFrame()
- : wxFrame( (wxFrame *)NULL, -1, "wxScrolledWindow sample",
- wxPoint(20,20), wxSize(470,360) )
+ : wxFrame(NULL, wxID_ANY, "wxWidgets scroll sample")
{
- wxMenu *file_menu = new wxMenu();
- file_menu->Append( ID_ABOUT, "&About..");
- file_menu->Append( ID_QUIT, "E&xit\tAlt-X");
+ SetIcon(wxICON(sample));
+
+ wxMenu *menuFile = new wxMenu;
+ menuFile->Append(wxID_ABOUT, "&About..");
+ menuFile->AppendSeparator();
+ menuFile->Append(wxID_EXIT, "E&xit\tAlt-X");
+
+ wxMenu *menuTest = new wxMenu;
+ menuTest->Append(Scroll_Test_Simple, "&Simple scroll window\tF1",
+ "Simplest possible scrolled window test.");
+ menuTest->Append(Scroll_Test_Canvas, "Scrolled window with &children\tF2",
+ "Scrolled window with controls on it.");
+ menuTest->Append(Scroll_Test_Sizers, "Scrolled window with si&zer\tF3",
+ "Scrolled window with children managed by sizer.");
+ menuTest->Append(Scroll_Test_Sub, "Scrolled s&ub-window\tF4",
+ "Window only part of which is scrolled.");
+ menuTest->Append(Scroll_Test_Auto, "&Auto-scrolled window\tF5",
+ "Window which scrolls when the mouse is held pressed "
+ "outside of it.");
+
+ wxMenuBar *mbar = new wxMenuBar;
+ mbar->Append(menuFile, "&File");
+ mbar->Append(menuTest, "&Test");
+
+ SetMenuBar( mbar );
+
+
+ wxPanel *panel = new wxPanel(this);
+
+ const wxSizerFlags flagsExpand(wxSizerFlags(1).Expand());
+
+ wxSizer *topsizer = new wxBoxSizer(wxVERTICAL);
+ topsizer->Add(new wxStaticText(panel, wxID_ANY,
+ "The windows below should behave in the same way, even though\n"
+ "they're implemented quite differently, see the code for details.\n"
+ "\n"
+ "The lines redrawn during odd/even repaint iterations are drawn in\n"
+ "red/blue colour to allow seeing immediately how much is repainted,\n"
+ "don't be surprised by this."),
+ wxSizerFlags().Centre().Border());
+
+ m_win1 = new MyScrolledWindowDumb(panel);
+ m_win2 = new MyScrolledWindowSmart(panel);
+
+ wxSizer *sizerScrollWin = new wxBoxSizer(wxHORIZONTAL);
+ sizerScrollWin->Add(m_win1, flagsExpand);
+ sizerScrollWin->Add(m_win2, flagsExpand);
+ topsizer->Add(sizerScrollWin, flagsExpand);
+
+ const wxSizerFlags
+ flagsHBorder(wxSizerFlags().Centre().Border(wxLEFT | wxRIGHT));
+
+ wxSizer *sizerBtns = new wxBoxSizer(wxHORIZONTAL);
+
+ // the radio buttons are in the same order as wxSHOW_SB_XXX values but
+ // offset by 1
+ const wxString visibilities[] = { "&never", "&default", "&always" };
+ wxRadioBox *radio = new wxRadioBox(panel, Scroll_Radio_ShowScrollbar,
+ "Left &scrollbar visibility: ",
+ wxDefaultPosition, wxDefaultSize,
+ WXSIZEOF(visibilities), visibilities);
+ radio->SetSelection(wxSHOW_SB_DEFAULT + 1);
+ sizerBtns->Add(radio, flagsHBorder);
+
+ sizerBtns->Add(new wxToggleButton(panel, Scroll_TglBtn_Sync, "S&ynchronize"),
+ flagsHBorder);
- wxMenuBar *menu_bar = new wxMenuBar();
- menu_bar->Append(file_menu, "&File");
+ topsizer->Add(sizerBtns, wxSizerFlags().Centre().Border());
- SetMenuBar( menu_bar );
+ panel->SetSizer(topsizer);
- CreateStatusBar(2);
- int widths[] = { -1, 100 };
- SetStatusWidths( 2, widths );
+ wxSize size = panel->GetBestSize();
+ SetSizeHints(size);
+ SetClientSize(2*size);
- m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
- m_canvas->SetScrollbars( 10, 10, 50, 100 );
+ Show();
}
-void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
+void MyFrame::OnToggleSync(wxCommandEvent& event)
{
- Close( TRUE );
+ if ( event.IsChecked() )
+ {
+ m_win1->SyncWith(m_win2);
+ m_win2->SyncWith(m_win1);
+ }
+ else
+ {
+ m_win1->SyncWith(NULL);
+ m_win2->SyncWith(NULL);
+ }
+}
+
+void MyFrame::OnScrollbarVisibility(wxCommandEvent& event)
+{
+ m_win1->ShowScrollbars(wxSHOW_SB_NEVER,
+ wxScrollbarVisibility(event.GetSelection() - 1));
+}
+
+void MyFrame::OnQuit(wxCommandEvent &WXUNUSED(event))
+{
+ Close(true);
}
void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
{
- (void)wxMessageBox( "wxScroll demo\n"
- "Robert Roebling (c) 1998",
- "About wxScroll Demo", wxICON_INFORMATION | wxOK );
+ (void)wxMessageBox( "Scrolled window sample\n"
+ "\n"
+ "Robert Roebling (c) 1998\n"
+ "Vadim Zeitlin (c) 2008\n"
+ "Autoscrolling examples\n"
+ "Ron Lee (c) 2002\n"
+ "Auto-timed-scrolling example\n"
+ "Matt Gregory (c) 2003\n",
+ "About wxWidgets scroll sample",
+ wxICON_INFORMATION | wxOK );
}
-//-----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
// MyApp
-//-----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_APP(MyApp)
bool MyApp::OnInit()
{
- wxFrame *frame = new MyFrame();
- frame->Show( TRUE );
+ if ( !wxApp::OnInit() )
+ return false;
+
+ new MyFrame();
+
+ return true;
+}
+
+// ----------------------------------------------------------------------------
+// MyScrolledWindowXXX
+// ----------------------------------------------------------------------------
+
+void MyScrolledWindowDumb::OnDraw(wxDC& dc)
+{
+ // this is useful to see which lines are redrawn
+ static size_t s_redrawCount = 0;
+ dc.SetTextForeground(s_redrawCount++ % 2 ? *wxRED : *wxBLUE);
+
+ int y = 0;
+ for ( size_t line = 0; line < m_nLines; line++ )
+ {
+ int yPhys;
+ CalcScrolledPosition(0, y, NULL, &yPhys);
+
+ dc.DrawText(wxString::Format("Line %u (logical %d, physical %d)",
+ unsigned(line), y, yPhys), 0, y);
+ y += m_hLine;
+ }
+}
+
+void MyScrolledWindowSmart::OnDraw(wxDC& dc)
+{
+ // this is useful to see which lines are redrawn
+ static size_t s_redrawCount = 0;
+ dc.SetTextForeground(s_redrawCount++ % 2 ? *wxRED : *wxBLUE);
+
+ // update region is always in device coords, translate to logical ones
+ wxRect rectUpdate = GetUpdateRegion().GetBox();
+ CalcUnscrolledPosition(rectUpdate.x, rectUpdate.y,
+ &rectUpdate.x, &rectUpdate.y);
+
+ size_t lineFrom = rectUpdate.y / m_hLine,
+ lineTo = rectUpdate.GetBottom() / m_hLine;
+
+ if ( lineTo > m_nLines - 1)
+ lineTo = m_nLines - 1;
+
+ int y = lineFrom*m_hLine;
+ for ( size_t line = lineFrom; line <= lineTo; line++ )
+ {
+ int yPhys;
+ CalcScrolledPosition(0, y, NULL, &yPhys);
+
+ dc.DrawText(wxString::Format("Line %u (logical %d, physical %d)",
+ unsigned(line), y, yPhys), 0, y);
+ y += m_hLine;
+ }
+}
+
+// ----------------------------------------------------------------------------
+// MyAutoScrollingWindow
+// ----------------------------------------------------------------------------
+
+BEGIN_EVENT_TABLE(MyAutoScrollingWindow, wxScrolled<wxWindow>)
+ EVT_LEFT_DOWN(MyAutoScrollingWindow::OnMouseLeftDown)
+ EVT_LEFT_UP(MyAutoScrollingWindow::OnMouseLeftUp)
+ EVT_MOTION(MyAutoScrollingWindow::OnMouseMove)
+ EVT_MOUSE_CAPTURE_LOST(MyAutoScrollingWindow::OnMouseCaptureLost)
+ EVT_SCROLLWIN(MyAutoScrollingWindow::OnScroll)
+END_EVENT_TABLE()
+
+MyAutoScrollingWindow::MyAutoScrollingWindow(wxWindow* parent)
+ : wxScrolled<wxWindow>(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
+ wxVSCROLL | wxHSCROLL | wxSUNKEN_BORDER),
+ m_selStart(-1, -1),
+ m_cursor(-1, -1),
+ m_font(9, wxFONTFAMILY_TELETYPE, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL)
+{
+ wxClientDC dc(this);
+ // query dc for text size
+ dc.SetFont(m_font);
+ dc.GetTextExtent(wxString("A"), &m_fontW, &m_fontH);
+ // set up the virtual window
+ SetScrollbars(m_fontW, m_fontH, sm_lineLen, sm_lineCnt);
+}
+
+wxRect
+MyAutoScrollingWindow::DeviceCoordsToGraphicalChars(wxRect updRect) const
+{
+ wxPoint pos(updRect.GetPosition());
+ pos = DeviceCoordsToGraphicalChars(pos);
+ updRect.x = pos.x;
+ updRect.y = pos.y;
+ updRect.width /= m_fontW;
+ updRect.height /= m_fontH;
+ // the *CoordsToGraphicalChars() funcs round down to upper-left corner,
+ // so an off-by-one correction is needed
+ ++updRect.width; // kludge
+ ++updRect.height; // kludge
+ return updRect;
+}
+
+wxPoint
+MyAutoScrollingWindow::DeviceCoordsToGraphicalChars(wxPoint pos) const
+{
+ pos.x /= m_fontW;
+ pos.y /= m_fontH;
+ pos += GetViewStart();
+ return pos;
+}
+
+wxPoint
+MyAutoScrollingWindow::GraphicalCharToDeviceCoords(wxPoint pos) const
+{
+ pos -= GetViewStart();
+ pos.x *= m_fontW;
+ pos.y *= m_fontH;
+ return pos;
+}
+
+wxRect
+MyAutoScrollingWindow::LogicalCoordsToGraphicalChars(wxRect updRect) const
+{
+ wxPoint pos(updRect.GetPosition());
+ pos = LogicalCoordsToGraphicalChars(pos);
+ updRect.x = pos.x;
+ updRect.y = pos.y;
+ updRect.width /= m_fontW;
+ updRect.height /= m_fontH;
+ // the *CoordsToGraphicalChars() funcs round down to upper-left corner,
+ // so an off-by-one correction is needed
+ ++updRect.width; // kludge
+ ++updRect.height; // kludge
+ return updRect;
+}
+
+wxPoint
+MyAutoScrollingWindow::LogicalCoordsToGraphicalChars(wxPoint pos) const
+{
+ pos.x /= m_fontW;
+ pos.y /= m_fontH;
+ return pos;
+}
+
+wxPoint
+MyAutoScrollingWindow::GraphicalCharToLogicalCoords(wxPoint pos) const
+{
+ pos.x *= m_fontW;
+ pos.y *= m_fontH;
+ return pos;
+}
+
+void MyAutoScrollingWindow::MyRefresh()
+{
+ static wxPoint lastSelStart(-1, -1), lastCursor(-1, -1);
+ // refresh last selected area (to deselect previously selected text)
+ wxRect lastUpdRect(
+ GraphicalCharToDeviceCoords(lastSelStart),
+ GraphicalCharToDeviceCoords(lastCursor)
+ );
+ // off-by-one corrections, necessary because it's not possible to know
+ // when to round up until rect is normalized by lastUpdRect constructor
+ lastUpdRect.width += m_fontW; // kludge
+ lastUpdRect.height += m_fontH; // kludge
+ // refresh currently selected (to select previously unselected text)
+ wxRect updRect(
+ GraphicalCharToDeviceCoords(m_selStart),
+ GraphicalCharToDeviceCoords(m_cursor)
+ );
+ // off-by-one corrections
+ updRect.width += m_fontW; // kludge
+ updRect.height += m_fontH; // kludge
+ // find necessary refresh areas
+ int rx = lastUpdRect.x;
+ int ry = lastUpdRect.y;
+ int rw = updRect.x - lastUpdRect.x;
+ int rh = lastUpdRect.height;
+ if (rw && rh) {
+ RefreshRect(DCNormalize(rx, ry, rw, rh));
+ }
+ rx = updRect.x;
+ ry = updRect.y + updRect.height;
+ rw= updRect.width;
+ rh = (lastUpdRect.y + lastUpdRect.height) - (updRect.y + updRect.height);
+ if (rw && rh) {
+ RefreshRect(DCNormalize(rx, ry, rw, rh));
+ }
+ rx = updRect.x + updRect.width;
+ ry = lastUpdRect.y;
+ rw = (lastUpdRect.x + lastUpdRect.width) - (updRect.x + updRect.width);
+ rh = lastUpdRect.height;
+ if (rw && rh) {
+ RefreshRect(DCNormalize(rx, ry, rw, rh));
+ }
+ rx = updRect.x;
+ ry = lastUpdRect.y;
+ rw = updRect.width;
+ rh = updRect.y - lastUpdRect.y;
+ if (rw && rh) {
+ RefreshRect(DCNormalize(rx, ry, rw, rh));
+ }
+ // update last
+ lastSelStart = m_selStart;
+ lastCursor = m_cursor;
+}
+
+bool MyAutoScrollingWindow::IsSelected(int chX, int chY) const
+{
+ if (IsInside(chX, m_selStart.x, m_cursor.x)
+ && IsInside(chY, m_selStart.y, m_cursor.y)) {
+ return true;
+ }
+ return false;
+}
+
+bool MyAutoScrollingWindow::IsInside(int k, int bound1, int bound2)
+{
+ if ((k >= bound1 && k <= bound2) || (k >= bound2 && k <= bound1)) {
+ return true;
+ }
+ return false;
+}
- return TRUE;
+wxRect
+MyAutoScrollingWindow::DCNormalize(int x, int y, int w, int h)
+{
+ // this is needed to get rid of the graphical remnants from the selection
+ // I think it's because DrawRectangle() excludes a pixel in either direction
+ const int kludge = 1;
+ // make (x, y) the top-left corner
+ if (w < 0) {
+ w = -w + kludge;
+ x -= w;
+ } else {
+ x -= kludge;
+ w += kludge;
+ }
+ if (h < 0) {
+ h = -h + kludge;
+ y -= h;
+ } else {
+ y -= kludge;
+ h += kludge;
+ }
+ return wxRect(x, y, w, h);
+}
+
+void MyAutoScrollingWindow::OnDraw(wxDC& dc)
+{
+ dc.SetFont(m_font);
+ wxBrush normBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW)
+ , wxSOLID);
+ wxBrush selBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHT)
+ , wxSOLID);
+ dc.SetPen(*wxTRANSPARENT_PEN);
+ const wxString str = sm_testData;
+ size_t strLength = str.length();
+ wxString::const_iterator str_i = str.begin();
+
+ // draw the characters
+ // 1. for each update region
+ for (wxRegionIterator upd(GetUpdateRegion()); upd; ++upd) {
+ wxRect updRect = upd.GetRect();
+ wxRect updRectInGChars(DeviceCoordsToGraphicalChars(updRect));
+ // 2. for each row of chars in the update region
+ for (int chY = updRectInGChars.y
+ ; chY <= updRectInGChars.y + updRectInGChars.height; ++chY) {
+ // 3. for each character in the row
+ bool isFirstX = true;
+ for (int chX = updRectInGChars.x
+ ; chX <= updRectInGChars.x + updRectInGChars.width
+ ; ++chX) {
+ // 4. set up dc
+ if (IsSelected(chX, chY)) {
+ dc.SetBrush(selBrush);
+ dc.SetTextForeground( wxSystemSettings::GetColour
+ (wxSYS_COLOUR_HIGHLIGHTTEXT));
+ } else {
+ dc.SetBrush(normBrush);
+ dc.SetTextForeground( wxSystemSettings::GetColour
+ (wxSYS_COLOUR_WINDOWTEXT));
+ }
+ // 5. find position info
+ wxPoint charPos = GraphicalCharToLogicalCoords(wxPoint
+ (chX, chY));
+ // 6. draw!
+ dc.DrawRectangle(charPos.x, charPos.y, m_fontW, m_fontH);
+ size_t charIndex = chY * sm_lineLen + chX;
+ if (chY < sm_lineCnt &&
+ chX < sm_lineLen &&
+ charIndex < strLength)
+ {
+ if (isFirstX)
+ {
+ str_i = str.begin() + charIndex;
+ isFirstX = false;
+ }
+ dc.DrawText(*str_i, charPos.x, charPos.y);
+ ++str_i;
+ }
+ }
+ }
+ }
+}
+
+void MyAutoScrollingWindow::OnMouseLeftDown(wxMouseEvent& event)
+{
+ // initial press of mouse button sets the beginning of the selection
+ m_selStart = DeviceCoordsToGraphicalChars(event.GetPosition());
+ // set the cursor to the same position
+ m_cursor = m_selStart;
+ // draw/erase selection
+ MyRefresh();
+}
+
+void MyAutoScrollingWindow::OnMouseLeftUp(wxMouseEvent& WXUNUSED(event))
+{
+ // this test is necessary
+ if (HasCapture()) {
+ // uncapture mouse
+ ReleaseMouse();
+ }
+}
+
+void MyAutoScrollingWindow::OnMouseMove(wxMouseEvent& event)
+{
+ // if user is dragging
+ if (event.Dragging() && event.LeftIsDown()) {
+ // set the new cursor position
+ m_cursor = DeviceCoordsToGraphicalChars(event.GetPosition());
+ // draw/erase selection
+ MyRefresh();
+ // capture mouse to activate auto-scrolling
+ if (!HasCapture()) {
+ CaptureMouse();
+ }
+ }
+}
+
+void
+MyAutoScrollingWindow::OnMouseCaptureLost(wxMouseCaptureLostEvent&
+ WXUNUSED(event))
+{
+ // we only capture mouse for timed scrolling, so nothing is needed here
+ // other than making sure to not call event.Skip()
+}
+
+void MyAutoScrollingWindow::OnScroll(wxScrollWinEvent& event)
+{
+ // need to move the cursor when autoscrolling
+ // FIXME: the cursor also moves when the scrollbar arrows are clicked
+ if (HasCapture()) {
+ if (event.GetOrientation() == wxHORIZONTAL) {
+ if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP) {
+ --m_cursor.x;
+ } else if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN) {
+ ++m_cursor.x;
+ }
+ } else if (event.GetOrientation() == wxVERTICAL) {
+ if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP) {
+ --m_cursor.y;
+ } else if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN) {
+ ++m_cursor.y;
+ }
+ }
+ }
+ MyRefresh();
+ event.Skip();
}
+const int MyAutoScrollingWindow::sm_lineCnt = 125;
+const int MyAutoScrollingWindow::sm_lineLen = 79;
+const char *MyAutoScrollingWindow::sm_testData =
+"162 Cult of the genius out of vanity. Because we think well of ourselves, but "
+"nonetheless never suppose ourselves capable of producing a painting like one of "
+"Raphael's or a dramatic scene like one of Shakespeare's, we convince ourselves "
+"that the capacity to do so is quite extraordinarily marvelous, a wholly "
+"uncommon accident, or, if we are still religiously inclined, a mercy from on "
+"high. Thus our vanity, our self-love, promotes the cult of the genius: for only "
+"if we think of him as being very remote from us, as a miraculum, does he not "
+"aggrieve us (even Goethe, who was without envy, called Shakespeare his star of "
+"the most distant heights [\"William! Stern der schonsten Ferne\": from Goethe's, "
+"\"Between Two Worlds\"]; in regard to which one might recall the lines: \"the "
+"stars, these we do not desire\" [from Goethe's, \"Comfort in Tears\"]). But, aside "
+"from these suggestions of our vanity, the activity of the genius seems in no "
+"way fundamentally different from the activity of the inventor of machines, the "
+"scholar of astronomy or history, the master of tactics. All these activities "
+"are explicable if one pictures to oneself people whose thinking is active in "
+"one direction, who employ everything as material, who always zealously observe "
+"their own inner life and that of others, who perceive everywhere models and "
+"incentives, who never tire of combining together the means available to them. "
+"Genius too does nothing except learn first how to lay bricks then how to build, "
+"except continually seek for material and continually form itself around it. "
+"Every activity of man is amazingly complicated, not only that of the genius: "
+"but none is a \"miracle.\" Whence, then, the belief that genius exists only in "
+"the artist, orator and philosopher? that only they have \"intuition\"? (Whereby "
+"they are supposed to possess a kind of miraculous eyeglass with which they can "
+"see directly into \"the essence of the thing\"!) It is clear that people speak of "
+"genius only where the effects of the great intellect are most pleasant to them "
+"and where they have no desire to feel envious. To call someone \"divine\" means: "
+"\"here there is no need for us to compete.\" Then, everything finished and "
+"complete is regarded with admiration, everything still becoming is undervalued. "
+"But no one can see in the work of the artist how it has become; that is its "
+"advantage, for wherever one can see the act of becoming one grows somewhat "
+"cool. The finished and perfect art of representation repulses all thinking as "
+"to how it has become; it tyrannizes as present completeness and perfection. "
+"That is why the masters of the art of representation count above all as gifted "
+"with genius and why men of science do not. In reality, this evaluation of the "
+"former and undervaluation of the latter is only a piece of childishness in the "
+"realm of reason. "
+"\n\n"
+"163 The serious workman. Do not talk about giftedness, inborn talents! One can "
+"name great men of all kinds who were very little gifted. The acquired "
+"greatness, became \"geniuses\" (as we put it), through qualities the lack of "
+"which no one who knew what they were would boast of: they all possessed that "
+"seriousness of the efficient workman which first learns to construct the parts "
+"properly before it ventures to fashion a great whole; they allowed themselves "
+"time for it, because they took more pleasure in making the little, secondary "
+"things well than in the effect of a dazzling whole. the recipe for becoming a "
+"good novelist, for example, is easy to give, but to carry it out presupposes "
+"qualities one is accustomed to overlook when one says \"I do not have enough "
+"talent.\" One has only to make a hundred or so sketches for novels, none longer "
+"than two pages but of such distinctness that every word in them is necessary; "
+"one should write down anecdotes each day until one has learned how to give them "
+"the most pregnant and effective form; one should be tireless in collecting and "
+"describing human types and characters; one should above all relate things to "
+"others and listen to others relate, keeping one's eyes and ears open for the "
+"effect produced on those present, one should travel like a landscape painter or "
+"costume designer; one should excerpt for oneself out of the individual sciences "
+"everything that will produce an artistic effect when it is well described, one "
+"should, finally, reflect on the motives of human actions, disdain no signpost "
+"to instruction about them and be a collector of these things by day and night. "
+"One should continue in this many-sided exercise some ten years: what is then "
+"created in the workshop, however, will be fit to go out into the world. What, "
+"however, do most people do? They begin, not with the parts, but with the whole. "
+"Perhaps they chance to strike a right note, excite attention and from then on "
+"strike worse and worse notes, for good, natural reasons. Sometimes, when the "
+"character and intellect needed to formulate such a life-plan are lacking, fate "
+"and need take their place and lead the future master step by step through all "
+"the stipulations of his trade. "
+"\n\n"
+"164 Peril and profit in the cult of the genius. The belief in great, superior, "
+"fruitful spirits is not necessarily, yet nonetheless is very frequently "
+"associated with that religious or semi-religious superstition that these "
+"spirits are of supra-human origin and possess certain miraculous abilities by "
+"virtue of which they acquire their knowledge by quite other means than the rest "
+"of mankind. One ascribes to them, it seems, a direct view of the nature of the "
+"world, as it were a hole in the cloak of appearance, and believes that, by "
+"virtue of this miraculous seer's vision, they are able to communicate something "
+"conclusive and decisive about man and the world without the toil and "
+"rigorousness required by science. As long as there continue to be those who "
+"believe in the miraculous in the domain of knowledge one can perhaps concede "
+"that these people themselves derive some benefit from their belief, inasmuch as "
+"through their unconditional subjection to the great spirits they create for "
+"their own spirit during its time of development the finest form of discipline "
+"and schooling. On the other hand, it is at least questionable whether the "
+"superstitious belief in genius, in its privileges and special abilities, is of "
+"benefit to the genius himself if it takes root in him. It is in any event a "
+"dangerous sign when a man is assailed by awe of himself, whether it be the "
+"celebrated Caesar's awe of Caesar or the awe of one's own genius now under "
+"consideration; when the sacrificial incense which is properly rendered only to "
+"a god penetrates the brain of the genius, so that his head begins to swim and "
+"he comes to regard himself as something supra-human. The consequences that "
+"slowly result are: the feeling of irresponsibility, of exceptional rights, the "
+"belief that he confers a favor by his mere presence, insane rage when anyone "
+"attempts even to compare him with others, let alone to rate him beneath them, "
+"or to draw attention to lapses in his work. Because he ceases to practice "
+"criticism of himself, at last one pinion after the other falls out of his "
+"plumage: that superstitious eats at the roots of his powers and perhaps even "
+"turns him into a hypocrite after his powers have fled from him. For the great "
+"spirits themselves it is therefore probably more beneficial if they acquire an "
+"insight into the nature and origin of their powers, if they grasp, that is to "
+"say, what purely human qualities have come together in them and what fortunate "
+"circumstances attended them: in the first place undiminished energy, resolute "
+"application to individual goals, great personal courage, then the good fortune "
+"to receive an upbringing which offered in the early years the finest teachers, "
+"models and methods. To be sure, when their goal is the production of the "
+"greatest possible effect, unclarity with regard to oneself and that "
+"semi-insanity superadded to it has always achieved much; for what has been "
+"admired and envied at all times has been that power in them by virtue of which "
+"they render men will-less and sweep them away into the delusion that the "
+"leaders they are following are supra-natural. Indeed, it elevates and inspires "
+"men to believe that someone is in possession of supra-natural powers: to this "
+"extent Plato was right to say [Plato: Phaedrus, 244a] that madness has brought "
+"the greatest of blessings upon mankind. In rare individual cases this portion "
+"of madness may, indeed, actually have been the means by which such a nature, "
+"excessive in all directions, was held firmly together: in the life of "
+"individuals, too, illusions that are in themselves poisons often play the role "
+"of healers; yet, in the end, in the case of every \"genius\" who believes in his "
+"own divinity the poison shows itself to the same degree as his \"genius\" grows "
+"old: one may recall, for example, the case of Napoleon, whose nature certainly "
+"grew into the mighty unity that sets him apart from all men of modern times "
+"precisely through his belief in himself and his star and through the contempt "
+"for men that flowed from it; until in the end, however, this same belief went "
+"over into an almost insane fatalism, robbed him of his acuteness and swiftness "
+"of perception, and became the cause of his destruction.";
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