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minor tab height bug fix
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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: gtk/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/gtk/private.h"
30
31 // ============================================================================
32 // implementation
33 // ============================================================================
34
35 // ----------------------------------------------------------------------------
36 // wxScrollHelper implementation
37 // ----------------------------------------------------------------------------
38
39 void wxScrollHelperNative::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_scrollBar[wxWindow::ScrollDir_Horz]->adjustment->value =
54 m_xScrollPosition = xPos;
55 m_win->m_scrollBar[wxWindow::ScrollDir_Vert]->adjustment->value =
56 m_yScrollPosition = yPos;
57
58 // Setting hints here should arguably be deprecated, but without it
59 // a sizer might override this manual scrollbar setting in old code.
60 // m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
61
62 int w = noUnitsX * pixelsPerUnitX;
63 int h = noUnitsY * pixelsPerUnitY;
64 m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
65 h ? h : wxDefaultCoord);
66
67 // If the target is not the same as the window with the scrollbars,
68 // then we need to update the scrollbars here, since they won't have
69 // been updated by SetVirtualSize().
70 if (m_targetWindow != m_win)
71 {
72 AdjustScrollbars();
73 }
74
75 if (!noRefresh)
76 {
77 int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
78 int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
79
80 m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
81 }
82 }
83
84 void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
85 int pixelsPerLine,
86 int winSize,
87 int virtSize,
88 int *lines,
89 int *linesPerPage)
90 {
91 int upper;
92 int page_size;
93 if (pixelsPerLine > 0 && winSize > 0 && winSize < virtSize)
94 {
95 upper = (virtSize + pixelsPerLine - 1) / pixelsPerLine;
96 page_size = winSize / pixelsPerLine;
97 *lines = upper;
98 *linesPerPage = page_size;
99 }
100 else
101 {
102 // GtkRange won't allow upper == lower, so for disabled state use [0,1]
103 // with a page size of 1. This will also clamp position to 0.
104 upper = 1;
105 page_size = 1;
106 *lines = 0;
107 *linesPerPage = 0;
108 }
109 GtkAdjustment* adj = range->adjustment;
110 adj->step_increment = 1;
111 adj->page_increment =
112 adj->page_size = page_size;
113 gtk_range_set_range(range, 0, upper);
114 }
115
116 void wxScrollHelperNative::AdjustScrollbars()
117 {
118 int w, h;
119 int vw, vh;
120
121 // this flag indicates which window has the scrollbars
122 m_win->m_hasScrolling = m_xScrollPixelsPerLine != 0 || m_yScrollPixelsPerLine != 0;
123
124 m_targetWindow->GetVirtualSize( &vw, &vh );
125
126 m_targetWindow->GetClientSize(&w, NULL);
127 DoAdjustScrollbar(
128 m_win->m_scrollBar[wxWindow::ScrollDir_Horz], m_xScrollPixelsPerLine,
129 w, vw, &m_xScrollLines, &m_xScrollLinesPerPage);
130 m_targetWindow->GetClientSize(NULL, &h);
131 DoAdjustScrollbar(
132 m_win->m_scrollBar[wxWindow::ScrollDir_Vert], m_yScrollPixelsPerLine,
133 h, vh, &m_yScrollLines, &m_yScrollLinesPerPage);
134
135 const int w_old = w;
136 m_targetWindow->GetClientSize(&w, NULL);
137 if (w != w_old)
138 {
139 // It is necessary to repeat the calculations in this case to avoid an
140 // observed infinite series of size events, involving alternating
141 // changes in visibility of the scrollbars.
142 // At this point, GTK+ has already queued a resize, which will cause
143 // AdjustScrollbars() to be called again. If the scrollbar visibility
144 // is not correct before then, yet another resize will occur, possibly
145 // leading to an unending series if the sizes are just right.
146 DoAdjustScrollbar(
147 m_win->m_scrollBar[wxWindow::ScrollDir_Horz], m_xScrollPixelsPerLine,
148 w, vw, &m_xScrollLines, &m_xScrollLinesPerPage);
149 m_targetWindow->GetClientSize(NULL, &h);
150 DoAdjustScrollbar(
151 m_win->m_scrollBar[wxWindow::ScrollDir_Vert], m_yScrollPixelsPerLine,
152 h, vh, &m_yScrollLines, &m_yScrollLinesPerPage);
153 }
154 }
155
156 void wxScrollHelperNative::DoScroll(int orient,
157 int pos,
158 int pixelsPerLine,
159 int *posOld)
160 {
161 if ( pos != -1 && pos != *posOld && pixelsPerLine )
162 {
163 m_win->SetScrollPos(orient, pos);
164 pos = m_win->GetScrollPos(orient);
165
166 int diff = (*posOld - pos)*pixelsPerLine;
167 m_targetWindow->ScrollWindow(orient == wxHORIZONTAL ? diff : 0,
168 orient == wxHORIZONTAL ? 0 : diff);
169
170 *posOld = pos;
171 }
172 }
173
174 void wxScrollHelperNative::Scroll( int x_pos, int y_pos )
175 {
176 wxCHECK_RET( m_targetWindow != 0, _T("No target window") );
177
178 DoScroll(wxHORIZONTAL, x_pos, m_xScrollPixelsPerLine, &m_xScrollPosition);
179 DoScroll(wxVERTICAL, y_pos, m_yScrollPixelsPerLine, &m_yScrollPosition);
180 }