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: scrolwin.cpp 37063 2006-01-23 01:14:32Z MR $
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
SetScrollbars(int pixelsPerUnitX,int pixelsPerUnitY,int noUnitsX,int noUnitsY,int xPos,int yPos,bool noRefresh)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_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
DoAdjustScrollbar(GtkAdjustment * adj,int pixelsPerLine,int winSize,int virtSize,int * pos,int * lines,int * linesPerPage)76 void wxScrollHelperNative::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
AdjustScrollbars()130 void wxScrollHelperNative::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
DoScroll(int orient,GtkAdjustment * adj,int pos,int pixelsPerLine,int * posOld)144 void wxScrollHelperNative::DoScroll(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
Scroll(int x_pos,int y_pos)172 void wxScrollHelperNative::Scroll( int x_pos, int y_pos )
173 {
174 wxCHECK_RET( m_targetWindow != 0, _T("No target window") );
175
176 DoScroll(wxHORIZONTAL, m_win->m_hAdjust, x_pos, m_xScrollPixelsPerLine,
177 &m_xScrollPosition);
178 DoScroll(wxVERTICAL, m_win->m_vAdjust, y_pos, m_yScrollPixelsPerLine,
179 &m_yScrollPosition);
180 }
181
182