Frames | No Frames |
1: /* GtkCheckboxPeer.java -- Implements CheckboxPeer with GTK 2: Copyright (C) 1998, 1999, 2002, 2003 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.java.awt.peer.gtk; 40: 41: import java.awt.Checkbox; 42: import java.awt.CheckboxGroup; 43: import java.awt.peer.CheckboxPeer; 44: 45: public class GtkCheckboxPeer extends GtkComponentPeer 46: implements CheckboxPeer 47: { 48: // Group from last time it was set. 49: public GtkCheckboxGroupPeer old_group; 50: // The current state of the GTK checkbox. 51: private boolean currentState; 52: private boolean changing = false; 53: 54: public native void create (GtkCheckboxGroupPeer group); 55: public native void nativeSetCheckboxGroup (GtkCheckboxGroupPeer group); 56: public native void connectSignals (); 57: native void gtkWidgetModifyFont (String name, int style, int size); 58: native void gtkButtonSetLabel (String label); 59: native void gtkToggleButtonSetActive (boolean is_active); 60: 61: public GtkCheckboxPeer (Checkbox c) 62: { 63: super (c); 64: } 65: 66: // FIXME: we must be able to switch between a checkbutton and a 67: // radiobutton dynamically. 68: public void create () 69: { 70: Checkbox checkbox = (Checkbox) awtComponent; 71: CheckboxGroup g = checkbox.getCheckboxGroup (); 72: old_group = GtkCheckboxGroupPeer.getCheckboxGroupPeer (g); 73: create (old_group); 74: gtkToggleButtonSetActive (checkbox.getState ()); 75: gtkButtonSetLabel (checkbox.getLabel ()); 76: } 77: 78: public void setState (boolean state) 79: { 80: // prevent item_toggled_cb -> postItemEvent -> 81: // awtComponent.setState -> this.setState -> 82: // gtkToggleButtonSetActive self-deadlock on the GDK lock. 83: if (changing && Thread.currentThread() == GtkToolkit.mainThread) 84: { 85: changing = false; 86: return; 87: } 88: 89: if (currentState != state) 90: gtkToggleButtonSetActive (state); 91: } 92: 93: public void setLabel (String label) 94: { 95: gtkButtonSetLabel (label); 96: } 97: 98: public void setCheckboxGroup (CheckboxGroup group) 99: { 100: GtkCheckboxGroupPeer gp 101: = GtkCheckboxGroupPeer.getCheckboxGroupPeer (group); 102: if (gp != old_group) 103: { 104: if (old_group != null) 105: old_group.remove (this); 106: nativeSetCheckboxGroup (gp); 107: old_group = gp; 108: } 109: } 110: 111: // Override the superclass postItemEvent so that the peer doesn't 112: // need information that we have. 113: // called back by native side: item_toggled_cb 114: public void postItemEvent (Object item, int stateChange) 115: { 116: Checkbox currentCheckBox = ((Checkbox)awtComponent); 117: // A firing of the event is only desired if the state has changed due to a 118: // button press. The currentCheckBox's state must be different from the 119: // one that the stateChange is changing to. 120: // stateChange = 1 if it goes from false -> true 121: // stateChange = 2 if it goes from true -> false 122: if (( !currentCheckBox.getState() && stateChange == 1) 123: || (currentCheckBox.getState() && stateChange == 2)) 124: { 125: super.postItemEvent (awtComponent, stateChange); 126: currentState = !currentCheckBox.getState(); 127: changing = true; 128: currentCheckBox.setState(currentState); 129: } 130: } 131: 132: public void dispose () 133: { 134: // Notify the group so that the native state can be cleaned up 135: // appropriately. 136: if (old_group != null) 137: old_group.remove (this); 138: super.dispose (); 139: } 140: }