| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/gtk1/scrolwin.cpp |
| 3 | // Purpose: wxScrolledWindow implementation |
| 4 | // Author: Robert Roebling |
| 5 | // Modified by: Ron Lee |
| 6 | // Vadim Zeitlin: removed 90% of duplicated common code |
| 7 | // Created: 01/02/97 |
| 8 | // RCS-ID: $Id$ |
| 9 | // Copyright: (c) Robert Roebling |
| 10 | // Licence: wxWindows licence |
| 11 | ///////////////////////////////////////////////////////////////////////////// |
| 12 | |
| 13 | // ============================================================================ |
| 14 | // declarations |
| 15 | // ============================================================================ |
| 16 | |
| 17 | // ---------------------------------------------------------------------------- |
| 18 | // headers |
| 19 | // ---------------------------------------------------------------------------- |
| 20 | |
| 21 | // For compilers that support precompilation, includes "wx.h". |
| 22 | #include "wx/wxprec.h" |
| 23 | |
| 24 | #ifdef __BORLANDC__ |
| 25 | #pragma hdrstop |
| 26 | #endif |
| 27 | |
| 28 | #include "wx/scrolwin.h" |
| 29 | #include "wx/gtk1/private.h" |
| 30 | |
| 31 | // ============================================================================ |
| 32 | // implementation |
| 33 | // ============================================================================ |
| 34 | |
| 35 | // ---------------------------------------------------------------------------- |
| 36 | // wxScrollHelper implementation |
| 37 | // ---------------------------------------------------------------------------- |
| 38 | |
| 39 | void wxScrollHelper::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY, |
| 40 | int noUnitsX, int noUnitsY, |
| 41 | int xPos, int yPos, |
| 42 | bool noRefresh) |
| 43 | { |
| 44 | int xs, ys; |
| 45 | GetViewStart(& xs, & ys); |
| 46 | |
| 47 | int old_x = m_xScrollPixelsPerLine * xs; |
| 48 | int old_y = m_yScrollPixelsPerLine * ys; |
| 49 | |
| 50 | m_xScrollPixelsPerLine = pixelsPerUnitX; |
| 51 | m_yScrollPixelsPerLine = pixelsPerUnitY; |
| 52 | |
| 53 | m_win->m_hAdjust->value = m_xScrollPosition = xPos; |
| 54 | m_win->m_vAdjust->value = m_yScrollPosition = yPos; |
| 55 | |
| 56 | // Setting hints here should arguably be deprecated, but without it |
| 57 | // a sizer might override this manual scrollbar setting in old code. |
| 58 | // m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY ); |
| 59 | |
| 60 | int w = noUnitsX * pixelsPerUnitX; |
| 61 | int h = noUnitsY * pixelsPerUnitY; |
| 62 | m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord, |
| 63 | h ? h : wxDefaultCoord); |
| 64 | |
| 65 | if (!noRefresh) |
| 66 | { |
| 67 | int new_x = m_xScrollPixelsPerLine * m_xScrollPosition; |
| 68 | int new_y = m_yScrollPixelsPerLine * m_yScrollPosition; |
| 69 | |
| 70 | m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y ); |
| 71 | } |
| 72 | |
| 73 | m_targetWindow->m_hasScrolling = pixelsPerUnitX || pixelsPerUnitY; |
| 74 | } |
| 75 | |
| 76 | void wxScrollHelper::DoAdjustScrollbar(GtkAdjustment *adj, |
| 77 | int pixelsPerLine, |
| 78 | int winSize, |
| 79 | int virtSize, |
| 80 | int *pos, |
| 81 | int *lines, |
| 82 | int *linesPerPage) |
| 83 | { |
| 84 | if ( pixelsPerLine == 0 ) |
| 85 | { |
| 86 | adj->upper = 1.0; |
| 87 | adj->page_increment = 1.0; |
| 88 | adj->page_size = 1.0; |
| 89 | } |
| 90 | else // we do have scrollbar |
| 91 | { |
| 92 | adj->upper = (virtSize + pixelsPerLine - 1) / pixelsPerLine; |
| 93 | adj->page_size = winSize / pixelsPerLine; |
| 94 | adj->page_increment = winSize / pixelsPerLine; |
| 95 | |
| 96 | // Special case. When client and virtual size are very close but |
| 97 | // the client is big enough, kill scrollbar. |
| 98 | |
| 99 | if ((adj->page_size < adj->upper) && (winSize >= virtSize)) |
| 100 | adj->page_size += 1.0; |
| 101 | |
| 102 | // If the scrollbar hits the right side, move the window |
| 103 | // right to keep it from over extending. |
| 104 | |
| 105 | if ( !wxIsNullDouble(adj->value) && |
| 106 | (adj->value + adj->page_size > adj->upper) ) |
| 107 | { |
| 108 | adj->value = adj->upper - adj->page_size; |
| 109 | if (adj->value < 0.0) |
| 110 | adj->value = 0.0; |
| 111 | |
| 112 | if ( m_win->GetChildren().empty() ) |
| 113 | { |
| 114 | // This is enough without child windows |
| 115 | *pos = (int)adj->value; |
| 116 | } |
| 117 | else |
| 118 | { |
| 119 | // We need to actually scroll window |
| 120 | gtk_signal_emit_by_name( GTK_OBJECT(adj), "value_changed" ); |
| 121 | } |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | *lines = (int)(adj->upper + 0.5); |
| 126 | *linesPerPage = (int)(adj->page_increment + 0.5); |
| 127 | gtk_signal_emit_by_name( GTK_OBJECT(adj), "changed" ); |
| 128 | } |
| 129 | |
| 130 | void wxScrollHelper::AdjustScrollbars() |
| 131 | { |
| 132 | int w, h; |
| 133 | int vw, vh; |
| 134 | |
| 135 | m_targetWindow->GetClientSize( &w, &h ); |
| 136 | m_targetWindow->GetVirtualSize( &vw, &vh ); |
| 137 | |
| 138 | DoAdjustScrollbar(m_win->m_hAdjust, m_xScrollPixelsPerLine, w, vw, |
| 139 | &m_xScrollPosition, &m_xScrollLines, &m_xScrollLinesPerPage); |
| 140 | DoAdjustScrollbar(m_win->m_vAdjust, m_yScrollPixelsPerLine, h, vh, |
| 141 | &m_yScrollPosition, &m_yScrollLines, &m_yScrollLinesPerPage); |
| 142 | } |
| 143 | |
| 144 | void wxScrollHelper::DoScrollOneDir(int orient, |
| 145 | GtkAdjustment *adj, |
| 146 | int pos, |
| 147 | int pixelsPerLine, |
| 148 | int *posOld) |
| 149 | { |
| 150 | if ( pos != -1 && pos != *posOld && pixelsPerLine ) |
| 151 | { |
| 152 | int max = (int)(adj->upper - adj->page_size + 0.5); |
| 153 | if (max < 0) |
| 154 | max = 0; |
| 155 | if (pos > max) |
| 156 | pos = max; |
| 157 | if (pos < 0) |
| 158 | pos = 0; |
| 159 | |
| 160 | adj->value = pos; |
| 161 | |
| 162 | int diff = (*posOld - pos)*pixelsPerLine; |
| 163 | m_targetWindow->ScrollWindow(orient == wxHORIZONTAL ? diff : 0, |
| 164 | orient == wxHORIZONTAL ? 0 : diff); |
| 165 | |
| 166 | *posOld = pos; |
| 167 | |
| 168 | m_win->GtkUpdateScrollbar(orient); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | void wxScrollHelper::DoScroll( int x_pos, int y_pos ) |
| 173 | { |
| 174 | wxCHECK_RET( m_targetWindow != 0, wxT("No target window") ); |
| 175 | |
| 176 | DoScrollOneDir(wxHORIZONTAL, m_win->m_hAdjust, x_pos, m_xScrollPixelsPerLine, |
| 177 | &m_xScrollPosition); |
| 178 | DoScrollOneDir(wxVERTICAL, m_win->m_vAdjust, y_pos, m_yScrollPixelsPerLine, |
| 179 | &m_yScrollPosition); |
| 180 | } |
| 181 | |
| 182 | void wxScrollHelper::DoShowScrollbars(wxScrollbarVisibility WXUNUSED(horz), |
| 183 | wxScrollbarVisibility WXUNUSED(vert)) |
| 184 | { |
| 185 | // TODO: not supported/implemented |
| 186 | } |
| 187 | |