| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/gtk1/slider.cpp |
| 3 | // Purpose: |
| 4 | // Author: Robert Roebling |
| 5 | // Id: $Id$ |
| 6 | // Copyright: (c) 1998 Robert Roebling |
| 7 | // Licence: wxWindows licence |
| 8 | ///////////////////////////////////////////////////////////////////////////// |
| 9 | |
| 10 | // For compilers that support precompilation, includes "wx.h". |
| 11 | #include "wx/wxprec.h" |
| 12 | |
| 13 | #if wxUSE_SLIDER |
| 14 | |
| 15 | #include "wx/slider.h" |
| 16 | |
| 17 | #ifndef WX_PRECOMP |
| 18 | #include "wx/utils.h" |
| 19 | #include "wx/math.h" |
| 20 | #endif |
| 21 | |
| 22 | #include "wx/gtk1/private.h" |
| 23 | |
| 24 | //----------------------------------------------------------------------------- |
| 25 | // idle system |
| 26 | //----------------------------------------------------------------------------- |
| 27 | |
| 28 | extern void wxapp_install_idle_handler(); |
| 29 | extern bool g_isIdle; |
| 30 | |
| 31 | //----------------------------------------------------------------------------- |
| 32 | // data |
| 33 | //----------------------------------------------------------------------------- |
| 34 | |
| 35 | extern bool g_blockEventsOnDrag; |
| 36 | |
| 37 | // ---------------------------------------------------------------------------- |
| 38 | // helper functions |
| 39 | // ---------------------------------------------------------------------------- |
| 40 | |
| 41 | // compare 2 adjustment values up to some (hardcoded) precision |
| 42 | static inline bool AreSameAdjustValues(double x, double y) |
| 43 | { |
| 44 | return fabs(x - y) < 0.02; |
| 45 | } |
| 46 | |
| 47 | // process a scroll event |
| 48 | static void |
| 49 | ProcessScrollEvent(wxSlider *win, wxEventType evtType, double dvalue) |
| 50 | { |
| 51 | int orient = win->GetWindowStyleFlag() & wxSL_VERTICAL ? wxVERTICAL |
| 52 | : wxHORIZONTAL; |
| 53 | |
| 54 | int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5); |
| 55 | wxScrollEvent event( evtType, win->GetId(), value, orient ); |
| 56 | event.SetEventObject( win ); |
| 57 | win->HandleWindowEvent( event ); |
| 58 | |
| 59 | if ( evtType != wxEVT_SCROLL_THUMBTRACK ) |
| 60 | { |
| 61 | wxScrollEvent event2(wxEVT_SCROLL_CHANGED, win->GetId(), value, orient); |
| 62 | event2.SetEventObject( win ); |
| 63 | win->HandleWindowEvent( event2 ); |
| 64 | } |
| 65 | |
| 66 | wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() ); |
| 67 | cevent.SetEventObject( win ); |
| 68 | cevent.SetInt( value ); |
| 69 | win->HandleWindowEvent( cevent ); |
| 70 | } |
| 71 | |
| 72 | //----------------------------------------------------------------------------- |
| 73 | // "value_changed" |
| 74 | //----------------------------------------------------------------------------- |
| 75 | |
| 76 | extern "C" { |
| 77 | static void gtk_slider_callback( GtkAdjustment *adjust, |
| 78 | SCROLLBAR_CBACK_ARG |
| 79 | wxSlider *win ) |
| 80 | { |
| 81 | if (g_isIdle) wxapp_install_idle_handler(); |
| 82 | |
| 83 | if (!win->m_hasVMT) return; |
| 84 | if (g_blockEventsOnDrag) return; |
| 85 | |
| 86 | const double dvalue = adjust->value; |
| 87 | const double diff = dvalue - win->m_oldPos; |
| 88 | if ( AreSameAdjustValues(diff, 0) ) |
| 89 | return; |
| 90 | |
| 91 | wxEventType evtType; |
| 92 | evtType = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget)); |
| 93 | |
| 94 | ProcessScrollEvent(win, evtType, dvalue); |
| 95 | |
| 96 | win->m_oldPos = dvalue; |
| 97 | } |
| 98 | |
| 99 | static gint gtk_slider_button_press_callback( GtkWidget * /* widget */, |
| 100 | GdkEventButton * /* gdk_event */, |
| 101 | wxWindowGTK *win) |
| 102 | { |
| 103 | // indicate that the thumb is being dragged with the mouse |
| 104 | win->m_isScrolling = true; |
| 105 | |
| 106 | return FALSE; |
| 107 | } |
| 108 | |
| 109 | static gint gtk_slider_button_release_callback( GtkWidget *scale, |
| 110 | GdkEventButton * /* gdk_event */, |
| 111 | wxSlider *win) |
| 112 | { |
| 113 | // not scrolling any longer |
| 114 | win->m_isScrolling = false; |
| 115 | |
| 116 | ProcessScrollEvent(win, wxEVT_SCROLL_THUMBRELEASE, |
| 117 | GTK_RANGE(scale)->adjustment->value); |
| 118 | |
| 119 | return FALSE; |
| 120 | } |
| 121 | |
| 122 | } |
| 123 | |
| 124 | //----------------------------------------------------------------------------- |
| 125 | // wxSlider |
| 126 | //----------------------------------------------------------------------------- |
| 127 | |
| 128 | bool wxSlider::Create(wxWindow *parent, wxWindowID id, |
| 129 | int value, int minValue, int maxValue, |
| 130 | const wxPoint& pos, const wxSize& size, |
| 131 | long style, const wxValidator& validator, const wxString& name ) |
| 132 | { |
| 133 | m_acceptsFocus = true; |
| 134 | m_needParent = true; |
| 135 | |
| 136 | if (!PreCreation( parent, pos, size ) || |
| 137 | !CreateBase( parent, id, pos, size, style, validator, name )) |
| 138 | { |
| 139 | wxFAIL_MSG( wxT("wxSlider creation failed") ); |
| 140 | return false; |
| 141 | } |
| 142 | |
| 143 | m_oldPos = 0.0; |
| 144 | |
| 145 | if (style & wxSL_VERTICAL) |
| 146 | m_widget = gtk_vscale_new( NULL ); |
| 147 | else |
| 148 | m_widget = gtk_hscale_new( NULL ); |
| 149 | |
| 150 | if (style & wxSL_LABELS) |
| 151 | { |
| 152 | gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE ); |
| 153 | gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 ); |
| 154 | |
| 155 | /* labels need more space and too small window will |
| 156 | cause junk to appear on the dialog */ |
| 157 | if (style & wxSL_VERTICAL) |
| 158 | { |
| 159 | wxSize sz( size ); |
| 160 | if (sz.x < 35) |
| 161 | { |
| 162 | sz.x = 35; |
| 163 | SetSize( sz ); |
| 164 | } |
| 165 | } |
| 166 | else |
| 167 | { |
| 168 | wxSize sz( size ); |
| 169 | if (sz.y < 35) |
| 170 | { |
| 171 | sz.y = 35; |
| 172 | SetSize( sz ); |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | else |
| 177 | gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE ); |
| 178 | |
| 179 | m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) ); |
| 180 | |
| 181 | GtkEnableEvents(); |
| 182 | gtk_signal_connect( GTK_OBJECT(m_widget), |
| 183 | "button_press_event", |
| 184 | (GtkSignalFunc)gtk_slider_button_press_callback, |
| 185 | (gpointer) this ); |
| 186 | gtk_signal_connect( GTK_OBJECT(m_widget), |
| 187 | "button_release_event", |
| 188 | (GtkSignalFunc)gtk_slider_button_release_callback, |
| 189 | (gpointer) this ); |
| 190 | |
| 191 | SetRange( minValue, maxValue ); |
| 192 | SetValue( value ); |
| 193 | |
| 194 | m_parent->DoAddChild( this ); |
| 195 | |
| 196 | PostCreation(size); |
| 197 | |
| 198 | return true; |
| 199 | } |
| 200 | |
| 201 | int wxSlider::GetValue() const |
| 202 | { |
| 203 | return wxRound(m_adjust->value); |
| 204 | } |
| 205 | |
| 206 | void wxSlider::SetValue( int value ) |
| 207 | { |
| 208 | double fpos = (double)value; |
| 209 | m_oldPos = fpos; |
| 210 | if ( AreSameAdjustValues(fpos, m_adjust->value) ) |
| 211 | return; |
| 212 | |
| 213 | m_adjust->value = fpos; |
| 214 | |
| 215 | GtkDisableEvents(); |
| 216 | |
| 217 | gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" ); |
| 218 | |
| 219 | GtkEnableEvents(); |
| 220 | } |
| 221 | |
| 222 | void wxSlider::SetRange( int minValue, int maxValue ) |
| 223 | { |
| 224 | double fmin = (double)minValue; |
| 225 | double fmax = (double)maxValue; |
| 226 | |
| 227 | if ((fabs(fmin-m_adjust->lower) < 0.2) && |
| 228 | (fabs(fmax-m_adjust->upper) < 0.2)) |
| 229 | { |
| 230 | return; |
| 231 | } |
| 232 | |
| 233 | m_adjust->lower = fmin; |
| 234 | m_adjust->upper = fmax; |
| 235 | m_adjust->step_increment = 1.0; |
| 236 | m_adjust->page_increment = ceil((fmax-fmin) / 10.0); |
| 237 | |
| 238 | GtkDisableEvents(); |
| 239 | |
| 240 | gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" ); |
| 241 | |
| 242 | GtkEnableEvents(); |
| 243 | } |
| 244 | |
| 245 | int wxSlider::GetMin() const |
| 246 | { |
| 247 | return (int)ceil(m_adjust->lower); |
| 248 | } |
| 249 | |
| 250 | int wxSlider::GetMax() const |
| 251 | { |
| 252 | return (int)ceil(m_adjust->upper); |
| 253 | } |
| 254 | |
| 255 | void wxSlider::SetPageSize( int pageSize ) |
| 256 | { |
| 257 | double fpage = (double)pageSize; |
| 258 | |
| 259 | if (fabs(fpage-m_adjust->page_increment) < 0.2) return; |
| 260 | |
| 261 | m_adjust->page_increment = fpage; |
| 262 | |
| 263 | GtkDisableEvents(); |
| 264 | |
| 265 | gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" ); |
| 266 | |
| 267 | GtkEnableEvents(); |
| 268 | } |
| 269 | |
| 270 | int wxSlider::GetPageSize() const |
| 271 | { |
| 272 | return (int)ceil(m_adjust->page_increment); |
| 273 | } |
| 274 | |
| 275 | void wxSlider::SetThumbLength( int len ) |
| 276 | { |
| 277 | double flen = (double)len; |
| 278 | |
| 279 | if (fabs(flen-m_adjust->page_size) < 0.2) return; |
| 280 | |
| 281 | m_adjust->page_size = flen; |
| 282 | |
| 283 | GtkDisableEvents(); |
| 284 | |
| 285 | gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" ); |
| 286 | |
| 287 | GtkEnableEvents(); |
| 288 | } |
| 289 | |
| 290 | int wxSlider::GetThumbLength() const |
| 291 | { |
| 292 | return (int)ceil(m_adjust->page_size); |
| 293 | } |
| 294 | |
| 295 | void wxSlider::SetLineSize( int WXUNUSED(lineSize) ) |
| 296 | { |
| 297 | } |
| 298 | |
| 299 | int wxSlider::GetLineSize() const |
| 300 | { |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | bool wxSlider::IsOwnGtkWindow( GdkWindow *window ) |
| 305 | { |
| 306 | GtkRange *range = GTK_RANGE(m_widget); |
| 307 | return ( (window == GTK_WIDGET(range)->window) |
| 308 | || (window == range->trough) |
| 309 | || (window == range->slider) |
| 310 | || (window == range->step_forw) |
| 311 | || (window == range->step_back) ); |
| 312 | } |
| 313 | |
| 314 | void wxSlider::GtkDisableEvents() |
| 315 | { |
| 316 | gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust), |
| 317 | GTK_SIGNAL_FUNC(gtk_slider_callback), |
| 318 | (gpointer) this ); |
| 319 | } |
| 320 | |
| 321 | void wxSlider::GtkEnableEvents() |
| 322 | { |
| 323 | gtk_signal_connect( GTK_OBJECT (m_adjust), |
| 324 | "value_changed", |
| 325 | GTK_SIGNAL_FUNC(gtk_slider_callback), |
| 326 | (gpointer) this ); |
| 327 | } |
| 328 | |
| 329 | // static |
| 330 | wxVisualAttributes |
| 331 | wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant)) |
| 332 | { |
| 333 | return GetDefaultAttributesFromGTKWidget(gtk_vscale_new); |
| 334 | } |
| 335 | |
| 336 | #endif // wxUSE_SLIDER |