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Code Issues Wiki Activity

Do not cache the GC

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This commit is contained in:
Michael Scharf 2007-10-16 14:56:44 +00:00
parent 8266f8929e
commit 494e3e0027
1 changed files with 12 additions and 20 deletions
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32
org.eclipse.tm.terminal/src/org/eclipse/tm/internal/terminal/textcanvas/VirtualCanvas.java
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@ -14,8 +14,6 @@ package org.eclipse.tm.internal.terminal.textcanvas;
import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status; import org.eclipse.core.runtime.Status;
import org.eclipse.swt.SWT; import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Point;
@ -34,9 +32,8 @@ import org.eclipse.tm.internal.terminal.control.impl.TerminalPlugin;
*/ */
public abstract class VirtualCanvas extends Canvas { public abstract class VirtualCanvas extends Canvas {
private Rectangle fVirtualBounds = new Rectangle(0,0,0,0); private final Rectangle fVirtualBounds = new Rectangle(0,0,0,0);
private Rectangle fClientArea; private Rectangle fClientArea;
private GC fPaintGC=null;
/** /**
* prevent infinite loop in {@link #updateScrollbars()} * prevent infinite loop in {@link #updateScrollbars()}
*/ */
@ -45,7 +42,6 @@ public abstract class VirtualCanvas extends Canvas {
public VirtualCanvas(Composite parent, int style) { public VirtualCanvas(Composite parent, int style) {
super(parent, style|SWT.NO_BACKGROUND|SWT.NO_REDRAW_RESIZE); super(parent, style|SWT.NO_BACKGROUND|SWT.NO_REDRAW_RESIZE);
fPaintGC= new GC(this);
fClientArea=getClientArea(); fClientArea=getClientArea();
addListener(SWT.Paint, new Listener() { addListener(SWT.Paint, new Listener() {
public void handleEvent(Event event) { public void handleEvent(Event event) {
@ -71,16 +67,7 @@ public abstract class VirtualCanvas extends Canvas {
} }
}); });
addDisposeListener(new DisposeListener(){ }
public void widgetDisposed(DisposeEvent e) {
if(fPaintGC!=null){
fPaintGC.dispose();
fPaintGC=null;
}
}
});
}
protected void onResize() { protected void onResize() {
updateViewRectangle(); updateViewRectangle();
} }
@ -149,10 +136,15 @@ public abstract class VirtualCanvas extends Canvas {
} }
protected void repaint(Rectangle r) { protected void repaint(Rectangle r) {
if (fPaintGC!=null) { if(isDisposed())
if(inClipping(r,fClientArea)) { return;
fPaintGC.setClipping(r); if(inClipping(r,fClientArea)) {
paint(fPaintGC); GC gc=new GC(this);
try {
gc.setClipping(r);
paint(gc);
} finally {
gc.dispose();
} }
} }
} }
@ -261,7 +253,7 @@ public abstract class VirtualCanvas extends Canvas {
return y-fVirtualBounds.y; return y-fVirtualBounds.y;
} }
/** called when the viewed part is changing */ /** called when the viewed part is changing */
private Rectangle fViewRectangle=new Rectangle(0,0,0,0); private final Rectangle fViewRectangle=new Rectangle(0,0,0,0);
protected void updateViewRectangle() { protected void updateViewRectangle() {
if( if(
fViewRectangle.x==-fVirtualBounds.x fViewRectangle.x==-fVirtualBounds.x