diff options
Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Canvas.java')
| -rwxr-xr-x | bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Canvas.java | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Canvas.java b/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Canvas.java new file mode 100755 index 0000000000..a1439d888b --- /dev/null +++ b/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Canvas.java @@ -0,0 +1,205 @@ +package org.eclipse.swt.widgets;
+
+/*
+ * Licensed Materials - Property of IBM,
+ * (c) Copyright IBM Corp. 1998, 2001 All Rights Reserved
+ */
+
+import org.eclipse.swt.internal.win32.*;
+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 agregates 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;
+
+/**
+ * Prevents uninitialized instances from being created outside the package.
+ */
+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);
+}
+
+/*
+* Not currently used.
+*/
+void clearArea (int x, int y, int width, int height) {
+ checkWidget ();
+ if (OS.IsWindowVisible (handle)) return;
+ RECT rect = new RECT ();
+ OS.SetRect (rect, x, y, x + width, y + height);
+ int hDC = OS.GetDCEx (handle, 0, OS.DCX_CACHE | OS.DCX_CLIPCHILDREN | OS.DCX_CLIPSIBLINGS);
+ drawBackground (hDC, rect);
+ OS.ReleaseDC (handle, hDC);
+}
+
+/**
+ * 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;
+}
+
+void releaseWidget () {
+ if (caret != null) caret.releaseWidget ();
+ caret = null;
+ super.releaseWidget ();
+}
+
+/**
+ * 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) {
+ checkWidget ();
+
+ /* Remove the caret so it won't get scrolled */
+ boolean isFocus = caret != null && caret.isFocusCaret ();
+ if (isFocus) caret.killFocus ();
+
+ /* Flush outstanding WM_PAINT's and scroll the window */
+ OS.RedrawWindow (handle, null, 0, OS.RDW_UPDATENOW | OS.RDW_ALLCHILDREN);
+ RECT rect = new RECT ();
+ OS.SetRect (rect, x, y, x + width, y + height);
+ int deltaX = destX - x, deltaY = destY - y;
+ int flags = OS.SW_INVALIDATE | OS.SW_ERASE;
+ if (all) flags |= OS.SW_SCROLLCHILDREN;
+ OS.ScrollWindowEx (handle, deltaX, deltaY, rect, null, 0, null, flags);
+
+ /* Restore the caret */
+ if (isFocus) caret.setFocus ();
+}
+
+/**
+ * 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
+ *
+ * @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) {
+ checkWidget ();
+ Caret newCaret = caret;
+ Caret oldCaret = this.caret;
+ this.caret = newCaret;
+ if (isFocusControl ()) {
+ if (oldCaret != null) oldCaret.killFocus ();
+ if (newCaret != null) newCaret.setFocus ();
+ }
+}
+
+public void setFont (Font font) {
+ checkWidget ();
+ super.setFont (font);
+ if (caret != null) caret.setFont (font);
+}
+
+LRESULT WM_KILLFOCUS (int wParam, int lParam) {
+ LRESULT result = super.WM_KILLFOCUS (wParam, lParam);
+ if (result != null) return result;
+ if (caret != null) caret.killFocus ();
+ return result;
+}
+
+LRESULT WM_SETFOCUS (int wParam, int lParam) {
+ LRESULT result = super.WM_SETFOCUS (wParam, lParam);
+ if (result != null) return result;
+ if (caret != null) caret.setFocus ();
+ return result;
+}
+
+}
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