diff dwtx/jface/internal/text/TableOwnerDrawSupport.d @ 129:eb30df5ca28b

Added JFace Text sources
author Frank Benoit <benoit@tionex.de>
date Sat, 23 Aug 2008 19:10:48 +0200
parents
children c4fb132a086c
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/internal/text/TableOwnerDrawSupport.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,172 @@
+/*******************************************************************************
+ * Copyright (c) 2008 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.internal.text.TableOwnerDrawSupport;
+
+import dwt.dwthelper.utils;
+
+import dwt.DWT;
+import dwt.custom.StyleRange;
+import dwt.graphics.Color;
+import dwt.graphics.GC;
+import dwt.graphics.Image;
+import dwt.graphics.Rectangle;
+import dwt.graphics.TextLayout;
+import dwt.widgets.Event;
+import dwt.widgets.Listener;
+import dwt.widgets.Table;
+import dwt.widgets.TableItem;
+
+
+/**
+ * Adds owner draw support for tables.
+ * 
+ * @since 3.4
+ */
+public class TableOwnerDrawSupport : Listener {
+    
+    private static final String STYLED_RANGES_KEY= "styled_ranges"; //$NON-NLS-1$
+    
+    private TextLayout fLayout;
+
+    public static void install(Table table) {
+        TableOwnerDrawSupport listener= new TableOwnerDrawSupport(table);
+        table.addListener(DWT.Dispose, listener);
+        table.addListener(DWT.MeasureItem, listener);
+        table.addListener(DWT.EraseItem, listener);
+        table.addListener(DWT.PaintItem, listener);
+    }
+    
+    /**
+     * Stores the styled ranges in the given table item.
+     * 
+     * @param item table item
+     * @param column the column index
+     * @param ranges the styled ranges or <code>null</code> to remove them
+     */
+    public static void storeStyleRanges(TableItem item, int column, StyleRange[] ranges) {
+        item.setData(STYLED_RANGES_KEY + column, ranges);
+    }
+    
+    /**
+     * Returns the styled ranges which are stored in the given table item.
+     * 
+     * @param item table item
+     * @param column the column index
+     * @return the styled ranges
+     */
+    private static StyleRange[] getStyledRanges(TableItem item, int column) {
+        return (StyleRange[])item.getData(STYLED_RANGES_KEY + column);
+    }
+
+    private TableOwnerDrawSupport(Table table) {
+        int orientation= table.getStyle() & (DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT);
+        fLayout= new TextLayout(table.getDisplay());
+        fLayout.setOrientation(orientation);
+    }
+
+    /*
+     * @see dwt.widgets.Listener#handleEvent(dwt.widgets.Event)
+     */
+    public void handleEvent(Event event) {
+        switch (event.type) {
+            case DWT.MeasureItem:
+                break;
+            case DWT.EraseItem:
+                event.detail &= ~DWT.FOREGROUND;
+                break;
+            case DWT.PaintItem:
+                performPaint(event);
+                break;
+            case DWT.Dispose:
+                widgetDisposed();
+                break;
+            }
+    }
+
+    /**
+     * Performs the paint operation.
+     * 
+     * @param event the event
+     */
+    private void performPaint(Event event) {
+        TableItem item= (TableItem) event.item;
+        GC gc= event.gc;
+        int index= event.index;
+        
+        bool isSelected= (event.detail & DWT.SELECTED) !is 0;
+        
+        // Remember colors to restore the GC later
+        Color oldForeground= gc.getForeground();
+        Color oldBackground= gc.getBackground();
+        
+        if (!isSelected) {
+            Color foreground= item.getForeground(index);
+            gc.setForeground(foreground);
+            
+            Color background= item.getBackground(index);
+            gc.setBackground(background);
+        }
+        
+        Image image=item.getImage(index);
+        if (image !is null) {
+            Rectangle imageBounds=item.getImageBounds(index);
+            Rectangle bounds=image.getBounds();
+            int x=imageBounds.x + Math.max(0, (imageBounds.width - bounds.width) / 2);
+            int y=imageBounds.y + Math.max(0, (imageBounds.height - bounds.height) / 2);
+            gc.drawImage(image, x, y);
+        }
+        
+        fLayout.setFont(item.getFont(index));
+        
+        // XXX: needed to clear the style info, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=226090
+        fLayout.setText(""); //$NON-NLS-1$
+        
+        fLayout.setText(item.getText(index));
+        
+        StyleRange[] ranges= getStyledRanges(item, index);
+        if (ranges !is null) {
+            for (int i= 0; i < ranges.length; i++) {
+                StyleRange curr= ranges[i];
+                if (isSelected) {
+                    curr= (StyleRange) curr.clone();
+                    curr.foreground= null;
+                    curr.background= null;
+                }
+                fLayout.setStyle(curr, curr.start, curr.start + curr.length - 1);
+            }
+        }
+        
+        Rectangle textBounds=item.getTextBounds(index);
+        if (textBounds !is null) {
+            Rectangle layoutBounds=fLayout.getBounds();
+            int x=textBounds.x;
+            int y=textBounds.y + Math.max(0, (textBounds.height - layoutBounds.height) / 2);
+            fLayout.draw(gc, x, y);
+        }
+        
+        if ((event.detail & DWT.FOCUSED) !is 0) {
+            Rectangle focusBounds=item.getBounds();
+            gc.drawFocus(focusBounds.x, focusBounds.y, focusBounds.width, focusBounds.height);
+        }
+        
+        if (!isSelected) {
+            gc.setForeground(oldForeground);
+            gc.setBackground(oldBackground);
+        }
+    }
+    
+    private void widgetDisposed() {
+        fLayout.dispose();
+    }
+}
+