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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/gtk/scrolbar.cpp
3 // Purpose:
4 // Author: Robert Roebling
5 // Id: $Id$
6 // Copyright: (c) 1998 Robert Roebling
7 // Licence: wxWindows licence
8 /////////////////////////////////////////////////////////////////////////////
9
10
11 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
12 #pragma implementation "scrolbar.h"
13 #endif
14
15 // For compilers that support precompilation, includes "wx.h".
16 #include "wx/wxprec.h"
17
18 #if wxUSE_SCROLLBAR
19
20 #include "wx/scrolbar.h"
21
22 #include "wx/utils.h"
23 #include "wx/math.h"
24 #include "wx/gtk/private.h"
25
26 //-----------------------------------------------------------------------------
27 // idle system
28 //-----------------------------------------------------------------------------
29
30 extern void wxapp_install_idle_handler();
31 extern bool g_isIdle;
32
33 //-----------------------------------------------------------------------------
34 // data
35 //-----------------------------------------------------------------------------
36
37 extern bool g_blockEventsOnDrag;
38 extern bool g_blockEventsOnScroll;
39 static wxEventType g_currentUpDownEvent = wxEVT_NULL;
40
41 static const float sensitivity = 0.02;
42
43 //-----------------------------------------------------------------------------
44 // "value_changed"
45 //-----------------------------------------------------------------------------
46
47 // FIXME: is GtkScrollType really passed to us as 2nd argument?
48
49 static void gtk_scrollbar_callback( GtkAdjustment *adjust,
50 SCROLLBAR_CBACK_ARG
51 wxScrollBar *win )
52 {
53 if (g_isIdle) wxapp_install_idle_handler();
54
55 if (!win->m_hasVMT) return;
56 if (g_blockEventsOnDrag) return;
57
58 float diff = adjust->value - win->m_oldPos;
59 if (fabs(diff) < sensitivity) return;
60
61 win->m_oldPos = adjust->value;
62
63 wxEventType command = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget));
64
65 double dvalue = adjust->value;
66 int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
67
68 int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
69
70 // throw a LINEUP / LINEDOWN event if necessary
71 if (g_currentUpDownEvent != wxEVT_NULL)
72 {
73 wxScrollEvent event( g_currentUpDownEvent, win->GetId(), value, orient );
74 event.SetEventObject( win );
75 win->GetEventHandler()->ProcessEvent( event );
76 }
77
78 // throw other event (wxEVT_SCROLL_THUMBTRACK)
79 wxScrollEvent event( command, win->GetId(), value, orient );
80 event.SetEventObject( win );
81 win->GetEventHandler()->ProcessEvent( event );
82
83 /*
84 wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
85 cevent.SetEventObject( win );
86 win->ProcessEvent( cevent );
87 */
88 }
89
90 //-----------------------------------------------------------------------------
91 // "button_press_event" from slider
92 //-----------------------------------------------------------------------------
93 static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
94 GdkEventButton *gdk_event,
95 wxScrollBar *win )
96 {
97 if (g_isIdle) wxapp_install_idle_handler();
98
99 // check if a LINEUP/LINEDOWN event must be thrown
100 // I suppose here the size of scrollbar top/bottom buttons is 16px height
101 if (gdk_event->type == GDK_BUTTON_PRESS && gdk_event->button == 1)
102 {
103 int scroll_height, mouse_pos;
104
105 // get the mouse position when the click is done
106 if (win->HasFlag(wxSB_VERTICAL))
107 {
108 scroll_height = GTK_WIDGET(widget)->allocation.height - 16;
109 mouse_pos = (int)gdk_event->y;
110 }
111 else
112 {
113 scroll_height = GTK_WIDGET(widget)->allocation.width - 16;
114 mouse_pos = (int)gdk_event->x;
115 }
116
117 // compare mouse position to scrollbar height
118 if (mouse_pos > scroll_height)
119 g_currentUpDownEvent = wxEVT_SCROLL_LINEDOWN;
120 else if (mouse_pos < 16)
121 g_currentUpDownEvent = wxEVT_SCROLL_LINEUP;
122 }
123
124 #ifndef __WXGTK20__
125 // There is no slider field any more
126 win->m_isScrolling = (gdk_event->window == widget->slider);
127 #endif
128
129 return FALSE;
130 }
131
132 //-----------------------------------------------------------------------------
133 // "button_release_event" from slider
134 //-----------------------------------------------------------------------------
135
136 static gint
137 gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
138 GdkEventButton *WXUNUSED(gdk_event),
139 wxScrollBar *win )
140 {
141 if (g_isIdle)
142 wxapp_install_idle_handler();
143
144 if (win->m_isScrolling)
145 {
146 wxEventType command = wxEVT_SCROLL_THUMBRELEASE;
147 int value = (int)ceil(win->m_adjust->value);
148 int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
149
150 wxScrollEvent event( command, win->GetId(), value, orient );
151 event.SetEventObject( win );
152 win->GetEventHandler()->ProcessEvent( event );
153 }
154
155 win->m_isScrolling = FALSE;
156
157 // reset the LINEUP/LINEDOWN flag when the mouse button is released
158 g_currentUpDownEvent = wxEVT_NULL;
159
160 return FALSE;
161 }
162
163 //-----------------------------------------------------------------------------
164 // wxScrollBar
165 //-----------------------------------------------------------------------------
166
167 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
168
169 wxScrollBar::~wxScrollBar()
170 {
171 }
172
173 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
174 const wxPoint& pos, const wxSize& size,
175 long style, const wxValidator& validator, const wxString& name )
176 {
177 m_needParent = TRUE;
178 m_acceptsFocus = TRUE;
179
180 if (!PreCreation( parent, pos, size ) ||
181 !CreateBase( parent, id, pos, size, style, validator, name ))
182 {
183 wxFAIL_MSG( wxT("wxScrollBar creation failed") );
184 return FALSE;
185 }
186
187 m_oldPos = 0.0;
188
189 if ((style & wxSB_VERTICAL) == wxSB_VERTICAL)
190 m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
191 else
192 m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
193
194 m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
195
196 gtk_signal_connect( GTK_OBJECT(m_adjust),
197 "value_changed",
198 (GtkSignalFunc) gtk_scrollbar_callback,
199 (gpointer) this );
200 gtk_signal_connect( GTK_OBJECT(m_widget),
201 "button_press_event",
202 (GtkSignalFunc)gtk_scrollbar_button_press_callback,
203 (gpointer) this );
204 gtk_signal_connect( GTK_OBJECT(m_widget),
205 "button_release_event",
206 (GtkSignalFunc)gtk_scrollbar_button_release_callback,
207 (gpointer) this );
208
209 m_parent->DoAddChild( this );
210
211 PostCreation(size);
212
213 return TRUE;
214 }
215
216 int wxScrollBar::GetThumbPosition() const
217 {
218 double val = m_adjust->value;
219 return (int)(val < 0 ? val - 0.5 : val + 0.5);
220 }
221
222 int wxScrollBar::GetThumbSize() const
223 {
224 return (int)(m_adjust->page_size+0.5);
225 }
226
227 int wxScrollBar::GetPageSize() const
228 {
229 return (int)(m_adjust->page_increment+0.5);
230 }
231
232 int wxScrollBar::GetRange() const
233 {
234 return (int)(m_adjust->upper+0.5);
235 }
236
237 void wxScrollBar::SetThumbPosition( int viewStart )
238 {
239 if (m_isScrolling) return;
240
241 float fpos = (float)viewStart;
242 m_oldPos = fpos;
243 if (fabs(fpos-m_adjust->value) < 0.2) return;
244 m_adjust->value = fpos;
245
246 gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
247 (GtkSignalFunc) gtk_scrollbar_callback,
248 (gpointer) this );
249
250 gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
251
252 gtk_signal_connect( GTK_OBJECT(m_adjust),
253 "value_changed",
254 (GtkSignalFunc) gtk_scrollbar_callback,
255 (gpointer) this );
256 }
257
258 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
259 bool WXUNUSED(refresh) )
260 {
261 float fpos = (float)position;
262 float frange = (float)range;
263 float fthumb = (float)thumbSize;
264 float fpage = (float)pageSize;
265
266 if ((fabs(frange-m_adjust->upper) < 0.2) &&
267 (fabs(fthumb-m_adjust->page_size) < 0.2) &&
268 (fabs(fpage-m_adjust->page_increment) < 0.2))
269 {
270 SetThumbPosition( position );
271 return;
272 }
273
274 m_oldPos = fpos;
275
276 m_adjust->lower = 0.0;
277 m_adjust->upper = frange;
278 m_adjust->value = fpos;
279 m_adjust->step_increment = 1.0;
280 m_adjust->page_increment = (float)(wxMax(fpage,0));
281 m_adjust->page_size = fthumb;
282
283 gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
284 }
285
286 /* Backward compatibility */
287 int wxScrollBar::GetValue() const
288 {
289 return GetThumbPosition();
290 }
291
292 void wxScrollBar::SetValue( int viewStart )
293 {
294 SetThumbPosition( viewStart );
295 }
296
297 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
298 {
299 int pos = (int)(m_adjust->value+0.5);
300 int thumb = (int)(m_adjust->page_size+0.5);
301 int page = (int)(m_adjust->page_increment+0.5);
302 int range = (int)(m_adjust->upper+0.5);
303
304 *viewStart = pos;
305 *viewLength = range;
306 *objectLength = thumb;
307 *pageLength = page;
308 }
309
310 int wxScrollBar::GetViewLength() const
311 {
312 return (int)(m_adjust->upper+0.5);
313 }
314
315 int wxScrollBar::GetObjectLength() const
316 {
317 return (int)(m_adjust->page_size+0.5);
318 }
319
320 void wxScrollBar::SetPageSize( int pageLength )
321 {
322 int pos = (int)(m_adjust->value+0.5);
323 int thumb = (int)(m_adjust->page_size+0.5);
324 int range = (int)(m_adjust->upper+0.5);
325 SetScrollbar( pos, thumb, range, pageLength );
326 }
327
328 void wxScrollBar::SetObjectLength( int objectLength )
329 {
330 int pos = (int)(m_adjust->value+0.5);
331 int page = (int)(m_adjust->page_increment+0.5);
332 int range = (int)(m_adjust->upper+0.5);
333 SetScrollbar( pos, objectLength, range, page );
334 }
335
336 void wxScrollBar::SetViewLength( int viewLength )
337 {
338 int pos = (int)(m_adjust->value+0.5);
339 int thumb = (int)(m_adjust->page_size+0.5);
340 int page = (int)(m_adjust->page_increment+0.5);
341 SetScrollbar( pos, thumb, viewLength, page );
342 }
343
344 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
345 {
346 GtkRange *range = GTK_RANGE(m_widget);
347 return ( (window == GTK_WIDGET(range)->window)
348 #ifndef __WXGTK20__
349 || (window == range->trough)
350 || (window == range->slider)
351 || (window == range->step_forw)
352 || (window == range->step_back)
353 #endif // GTK+ 1.x
354 );
355 }
356
357 wxSize wxScrollBar::DoGetBestSize() const
358 {
359 return wxControl::DoGetBestSize();
360 }
361
362 // static
363 wxVisualAttributes
364 wxScrollBar::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
365 {
366 return GetDefaultAttributesFromGTKWidget(gtk_vscrollbar_new);
367 }
368
369 #endif