1 files changed, 264 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/gtk1x/org/eclipse/swt/widgets/Canvas.java b/bundles/org.eclipse.swt/Eclipse SWT/gtk1x/org/eclipse/swt/widgets/Canvas.java
new file mode 100644
index 0000000000..3374e5cc65
--- /dev/null
+++ b/bundles/org.eclipse.swt/Eclipse SWT/gtk1x/org/eclipse/swt/widgets/Canvas.java
@@ -0,0 +1,264 @@
+package org.eclipse.swt.widgets;
+
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved
+ */
+
+import org.eclipse.swt.internal.gtk.*;
+import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
+
+/**
+ * Instances of this class provide a surface for drawing
+ * arbitrary graphics.
+ * <dl>
+ * <dt><b>Styles:</b></dt>
+ * <dd>(none)</dd>
+ * <dt><b>Events:</b></dt>
+ * <dd>(none)</dd>
+ * </dl>
+ * <p>
+ * This class may be subclassed by custom control implementors
+ * who are building controls that are <em>not</em> constructed
+ * from aggregates of other controls. That is, they are either
+ * painted using SWT graphics calls or are handled by native
+ * methods.
+ * </p>
+ *
+ * @see Composite
+ */
+public class Canvas extends Composite {
+
+	Caret caret;
+
+/*
+ *   ===  CONSTRUCTORS  ===
+ */
+
+
+Canvas () {}
+
+/**
+ * Constructs a new instance of this class given its parent
+ * and a style value describing its behavior and appearance.
+ * <p>
+ * The style value is either one of the style constants defined in
+ * class <code>SWT</code> which is applicable to instances of this
+ * class, or must be built by <em>bitwise OR</em>'ing together 
+ * (that is, using the <code>int</code> "|" operator) two or more
+ * of those <code>SWT</code> style constants. The class description
+ * for all SWT widget classes should include a comment which
+ * describes the style constants which are applicable to the class.
+ * </p>
+ *
+ * @param parent a composite control which will be the parent of the new instance (cannot be null)
+ * @param style the style of control to construct
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
+ *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
+ * </ul>
+ *
+ * @see SWT
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public Canvas (Composite parent, int style) {
+	super (parent, style);
+}
+
+/**
+ * Returns the caret.
+ * <p>
+ * The caret for the control is automatically hidden
+ * and shown when the control is painted or resized,
+ * when focus is gained or lost and when an the control
+ * is scrolled.  To avoid drawing on top of the caret,
+ * the programmer must hide and show the caret when
+ * drawing in the window any other time.
+ * </p>
+ *
+ * @return the caret
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Caret getCaret () {
+	checkWidget();
+	return caret;
+}
+
+/**
+ * Scrolls a rectangular area of the receiver by first copying 
+ * the source area to the destination and then causing the area
+ * of the source which is not covered by the destination to
+ * be repainted. Children that intersect the rectangle are
+ * optionally moved during the operation. In addition, outstanding
+ * paint events are flushed before the source area is copied to
+ * ensure that the contents of the canvas are drawn correctly.
+ *
+ * @param destX the x coordinate of the destination
+ * @param destY the y coordinate of the destination
+ * @param x the x coordinate of the source
+ * @param y the y coordinate of the source
+ * @param width the width of the area
+ * @param height the height of the area
+ * @param all <code>true</code>if children should be scrolled, and <code>false</code> otherwise
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void scroll (int destX, int destY, int x, int y, int width, int height, boolean all) {
+	if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
+	if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED);
+
+	if (width <= 0 || height <= 0) return;
+	int deltaX = destX - x, deltaY = destY - y;
+	if (deltaX == 0 && deltaY == 0) return;
+	if (!isVisible ()) return;
+	
+	/* Hide the caret */
+	boolean isVisible = (caret != null) && (caret.isVisible ());
+	if (isVisible) caret.hideCaret ();
+	
+	GtkWidget widget = new GtkWidget();
+	OS.memmove (widget, paintHandle(), GtkWidget.sizeof);
+	int window = widget.window;
+	if (window == 0) return;
+
+	/* Emit a NoExpose Event */
+	int gc = OS.gdk_gc_new (window);
+	OS.gdk_gc_set_exposures(gc, true);
+	OS.gdk_window_copy_area (window, gc, x, y, window, x, y, width, height);
+	OS.gdk_gc_destroy (gc);
+
+	/* Flush outstanding Exposes */
+	int eventHandle=0;
+	while ((eventHandle = OS.gdk_event_get_graphics_expose(window)) != 0) {
+		OS.gtk_widget_event(handle, eventHandle);
+		OS.gdk_event_free(eventHandle);	
+	}
+
+	/* Scroll the window */
+	int gc1 = OS.gdk_gc_new (window);
+	OS.gdk_gc_set_exposures(gc1, true);
+	OS.gdk_window_copy_area (window, gc1, destX, destY, window, x, y, width, height);
+	OS.gdk_gc_destroy (gc1);
+	boolean disjoint = (destX + width < x) || (x + width < destX) || (destY + height < y) || (y + height < destY);
+	if (disjoint) {
+		OS.gdk_window_clear_area(window, x, y, width, height);
+	} else {
+		if (deltaX != 0) {
+			int newX = destX - deltaX;
+			if (deltaX < 0) newX = destX + width;
+			OS.gdk_window_clear_area_e(window, newX, y, Math.abs (deltaX), height);
+		}
+		if (deltaY != 0) {
+			int newY = destY - deltaY;
+			if (deltaY < 0) newY = destY + height;
+			OS.gdk_window_clear_area_e (window, x, newY, width, Math.abs (deltaY));
+		}
+	}
+	
+	/* Show the caret */
+	if (isVisible) caret.showCaret ();
+}
+/**
+ * Sets the receiver's caret.
+ * <p>
+ * The caret for the control is automatically hidden
+ * and shown when the control is painted or resized,
+ * when focus is gained or lost and when an the control
+ * is scrolled.  To avoid drawing on top of the caret,
+ * the programmer must hide and show the caret when
+ * drawing in the window any other time.
+ * </p>
+ * @param caret the new caret for the receiver, may be null
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the caret has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setCaret (Caret caret) {
+	if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
+	if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED);
+	Caret newCaret = caret;
+	Caret oldCaret = this.caret;
+	this.caret = newCaret;
+	if (isFocusControl()) {
+		if (oldCaret != null) oldCaret.killFocus ();
+		if (newCaret != null) newCaret.setFocus ();
+	}
+}
+public boolean setFocus () {
+	if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
+	if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED);
+	if ((style & SWT.NO_FOCUS) != 0) return false;
+	return super.setFocus ();
+}
+int processFocusIn (int int0, int int1, int int2) {
+	int result = super.processFocusIn (int0, int1, int2);
+	if (caret != null) caret.setFocus ();
+	return result;
+}
+int processFocusOut(int int0, int int1, int int2) {
+	int result = super.processFocusOut (int0, int1, int2);
+	if (caret != null) caret.killFocus ();
+	return result;
+}
+/*
+int processMouseDown (int callData, int arg1, int int2) {
+	if ((UtilFuncs.GTK_WIDGET_GET_FLAGS(handle) & OS.GTK_HAS_FOCUS) == 0)
+		OS.gtk_widget_grab_focus(handle);
+	GdkEventButton gdkEvent = new GdkEventButton ();
+	OS.memmove (gdkEvent, callData, GdkEventButton.sizeof);
+	int eventType = SWT.MouseDown;
+	if (gdkEvent.type == OS.GDK_2BUTTON_PRESS) eventType = SWT.MouseDoubleClick;
+	sendMouseEvent (eventType, gdkEvent.button, gdkEvent.state, gdkEvent.time, (int)gdkEvent.x, (int)gdkEvent.y);
+	if (gdkEvent.button == 3 && menu != null) {
+		menu.setVisible (true);
+	}
+	return 1;
+}
+
+int processMouseUp (int callData, int arg1, int int2) {
+	GdkEventButton gdkEvent = new GdkEventButton ();
+	OS.memmove (gdkEvent, callData, GdkEventButton.sizeof);
+	sendMouseEvent (SWT.MouseUp, gdkEvent.button, gdkEvent.state, gdkEvent.time, (int)gdkEvent.x, (int)gdkEvent.y);
+	return 1;
+}
+*/
+int processPaint (int callData, int arg1, int int2) {
+	//if (!hooks (SWT.Paint)) return 0;
+
+	GdkEventExpose gdkEvent = new GdkEventExpose ();
+	OS.memmove (gdkEvent, callData, GdkEventExpose.sizeof);
+	Event event = new Event ();
+	event.count = gdkEvent.count;
+	event.x = gdkEvent.x;  event.y = gdkEvent.y;
+	event.width = gdkEvent.width;  event.height = gdkEvent.height;
+	GC gc = event.gc = new GC (this);
+	sendEvent (SWT.Paint, event);
+	gc.dispose ();
+	event.gc = null;
+	return 0;
+}
+void releaseWidget () {
+	if (caret != null) caret.releaseWidget ();
+	caret = null;
+	super.releaseWidget ();
+}
+
+}