src/ui/dialog/desktop-tracker.cpp

   1 /**
   2  * Glyph selector dialog.
   3  */
   4
   5 /* Authors:
   6  *   Jon A. Cruz
   7  *
   8  * Copyright (C) 2010 Jon A. Cruz
   9  * Released under GNU GPL, read the file 'COPYING' for more information
  10  */
  11
  12 #include <glib-object.h>
  13
  14 #include "desktop-tracker.h"
  15
  16 #include "inkscape.h"
  17 #include "desktop.h"
  18 #include "widgets/desktop-widget.h"
  19
  20 namespace Inkscape {
  21 namespace UI {
  22 namespace Dialog {
  23
  24 DesktopTracker::DesktopTracker() :
  25     base(0),
  26     desktop(0),
  27     widget(0),
  28     hierID(0),
  29     inkID(0),
  30     trackActive(false),
  31     desktopChangedSig()
  32 {
  33 }
  34
  35 DesktopTracker::~DesktopTracker()
  36 {
  37     disconnect();
  38 }
  39
  40 void DesktopTracker::connect(GtkWidget *widget)
  41 {
  42     disconnect();
  43
  44     this->widget = widget;
  45
  46     // Use C/gobject callbacks to avoid gtkmm rewrap-during-destruct issues:
  47     hierID = g_signal_connect( G_OBJECT(widget), "hierarchy-changed", G_CALLBACK(hierarchyChangeCB), this );
  48     inkID = g_signal_connect( G_OBJECT(INKSCAPE), "activate_desktop", G_CALLBACK(activateDesktopCB), this );
  49
  50     GtkWidget *wdgt = gtk_widget_get_ancestor(widget, SP_TYPE_DESKTOP_WIDGET);
  51     if (wdgt && !base) {
  52         SPDesktopWidget *dtw = SP_DESKTOP_WIDGET(wdgt);
  53         if (dtw && dtw->desktop) {
  54             setBase(dtw->desktop); // may also set desktop
  55         }
  56     }
  57 }
  58
  59 void DesktopTracker::disconnect()
  60 {
  61     if (hierID) {
  62         if (widget) {
  63             g_signal_handler_disconnect(G_OBJECT(widget), hierID);
  64         }
  65         hierID = 0;
  66     }
  67     if (inkID) {
  68         if (INKSCAPE) {
  69             g_signal_handler_disconnect(G_OBJECT(INKSCAPE), inkID);
  70         }
  71         inkID = 0;
  72     }
  73 }
  74
  75 void DesktopTracker::setBase(SPDesktop *desktop)
  76 {
  77     if (this->base != desktop) {
  78         base = desktop;
  79         // Do not override an existing target desktop
  80         if (!this->desktop) {
  81             setDesktop(desktop);
  82         }
  83     }
  84 }
  85
  86 SPDesktop *DesktopTracker::getBase() const
  87 {
  88     return base;
  89 }
  90
  91 SPDesktop *DesktopTracker::getDesktop() const
  92 {
  93     return desktop;
  94 }
  95
  96 sigc::connection DesktopTracker::connectDesktopChanged( const sigc::slot<void, SPDesktop*> & slot )
  97 {
  98     return desktopChangedSig.connect(slot);
  99 }
 100
 101 gboolean DesktopTracker::activateDesktopCB(Inkscape::Application */*inkscape*/, SPDesktop *desktop, DesktopTracker *self )
 102 {
 103     if (self && self->trackActive) {
 104         self->setDesktop(desktop);
 105     }
 106     return FALSE;
 107 }
 108
 109 bool DesktopTracker::hierarchyChangeCB(GtkWidget * /*widget*/, GtkWidget* /*prev*/, DesktopTracker *self)
 110 {
 111     if (self) {
 112         self->handleHierarchyChange();
 113     }
 114     return false;
 115 }
 116
 117 void DesktopTracker::handleHierarchyChange()
 118 {
 119     GtkWidget *wdgt = gtk_widget_get_ancestor(widget, SP_TYPE_DESKTOP_WIDGET);
 120     bool newFlag = (wdgt == 0); // true means not in an SPDesktopWidget, thus floating.
 121     if (wdgt && !base) {
 122         SPDesktopWidget *dtw = SP_DESKTOP_WIDGET(wdgt);
 123         if (dtw && dtw->desktop) {
 124             setBase(dtw->desktop); // may also set desktop
 125         }
 126     }
 127     if (newFlag != trackActive) {
 128         trackActive = newFlag;
 129         if (trackActive) {
 130             setDesktop(SP_ACTIVE_DESKTOP);
 131         } else if (desktop != base) {
 132             setDesktop(getBase());
 133         }
 134     }
 135 }
 136
 137 void DesktopTracker::setDesktop(SPDesktop *desktop)
 138 {
 139     if (desktop != this->desktop) {
 140         this->desktop = desktop;
 141         desktopChangedSig.emit(desktop);
 142     }
 143 }
 144
 145
 146 } // namespace Dialog
 147 } // namespace UI
 148 } // namespace Inkscape
 149
 150 /*
 151   Local Variables:
 152   mode:c++
 153   c-file-style:"stroustrup"
 154   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 155   indent-tabs-mode:nil
 156   fill-column:99
 157   End:
 158 */
 159 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :