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package org.eclipse.swt.widgets;
/*
* Licensed Materials - Property of IBM,
* SWT - The Simple Widget Toolkit,
* (c) Copyright IBM Corp 1998, 1999.
*/
/**
* The canvas class implements a drawing area for
* arbitrary graphics.
*
* Styles
*
* NO_BACKGROUND,
* NO_FOCUS,
* MERGE_EXPOSES,
* RESIZE_REDRAW
*
* Events
*
**/
/* Imports */
import org.eclipse.swt.internal.motif.*;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
/* Class Definition */
public class Canvas extends Composite {
Caret caret;
Canvas () {
/* Do nothing */
}
/**
* Create a Canvas.
*
* PARAMTERS
*
* parent a composite widget (cannot be null)
* style the bitwise OR'ing of widget styles
*
* REMARKS
*
* This method creates a child widget using style bits
* to select a particular look or set of properties.
*
**/
public Canvas (Composite parent, int style) {
super (parent, style);
}
void createWidget (int index) {
super.createWidget (index);
fontList = defaultFont ();
}
/**
* Get the current caret.
*
* REMARKS
*
* This method gets the current caret for the window.
* The current caret is automatically hidden and shown
* by the window when:
*
* - during expose and resize
* - when focus is gained or lost
* - when an the window is scrolled
*
**/
public Caret getCaret () {
if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED);
return caret;
}
int processFocusIn () {
int result = super.processFocusIn ();
if (caret != null) caret.setFocus ();
return result;
}
int processFocusOut () {
int result = super.processFocusOut ();
if (caret != null) caret.killFocus ();
return result;
}
int processPaint (int callData) {
boolean isFocus = caret != null && caret.isFocusCaret ();
if (isFocus) caret.killFocus ();
int result = super.processPaint (callData);
if (isFocus) caret.setFocus ();
return result;
}
void redrawWidget (int x, int y, int width, int height, boolean all) {
boolean isFocus = caret != null && caret.isFocusCaret ();
if (isFocus) caret.killFocus ();
super.redrawWidget (x, y, width, height, all);
if (isFocus) caret.setFocus ();
}
void releaseWidget () {
if (caret != null) {
caret.releaseWidget ();
caret.releaseHandle ();
}
caret = null;
super.releaseWidget();
}
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 isFocus = caret != null && caret.isFocusCaret ();
if (isFocus) caret.killFocus ();
/* Flush outstanding exposes */
int xDisplay = OS.XtDisplay (handle);
if (xDisplay == 0) return;
int xWindow = OS.XtWindow (handle);
if (xWindow == 0) return;
XAnyEvent xEvent = new XAnyEvent ();
OS.XSync (xDisplay, false); OS.XSync (xDisplay, false);
while (OS.XCheckWindowEvent (xDisplay, xWindow, OS.ExposureMask, xEvent)) {
OS.XtDispatchEvent (xEvent);
}
/* Scroll the window */
int xGC = OS.XCreateGC (xDisplay, xWindow, 0, null);
OS.XCopyArea (xDisplay, xWindow, xWindow, xGC, x, y, width, height, destX, destY);
OS.XFreeGC (xDisplay, xGC);
boolean disjoint = (destX + width < x) || (x + width < destX) || (destY + height < y) || (y + height < destY);
if (disjoint) {
OS.XClearArea (xDisplay, xWindow, x, y, width, height, true);
} else {
if (deltaX != 0) {
int newX = destX - deltaX;
if (deltaX < 0) newX = destX + width;
OS.XClearArea (xDisplay, xWindow, newX, y, Math.abs (deltaX), height, true);
}
if (deltaY != 0) {
int newY = destY - deltaY;
if (deltaY < 0) newY = destY + height;
OS.XClearArea (xDisplay, xWindow, x, newY, width, Math.abs (deltaY), true);
}
}
/* Show the caret */
if (isFocus) caret.setFocus ();
}
public void setBounds (int x, int y, int width, int height) {
if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED);
boolean isFocus = caret != null && caret.isFocusCaret ();
if (isFocus) caret.killFocus ();
super.setBounds (x, y, width, height);
if (isFocus) caret.setFocus ();
}
/**
* Set the current caret.
*
* PARAMTERS
*
* caret - the new caret or null
*
* REMARKS
*
* This method sets the current caret for the window.
* The current caret is automatically hidden and shown
* by the window when:
*
* - during expose and resize
* - when focus is gained or lost
* - when an the window is scrolled
*
**/
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 (hasFocus ()) {
if (oldCaret != null) oldCaret.killFocus ();
if (newCaret != null) newCaret.setFocus ();
}
}
public void setLocation (int x, int y) {
if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED);
boolean isFocus = caret != null && caret.isFocusCaret ();
if (isFocus) caret.killFocus ();
super.setLocation (x, y);
if (isFocus) caret.setFocus ();
}
public void setSize (int width, int height) {
if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED);
boolean isFocus = caret != null && caret.isFocusCaret ();
if (isFocus) caret.killFocus ();
super.setSize (width, height);
if (isFocus) caret.setFocus ();
}
}
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