Bug 510728 - [CSS] Allow styling of tree headers via CSS

This adjusts the Control Example to support the selection of the tree
header foreground and background. Also added tests for table and tree
header colors.

Change-Id: Ia4f0e7e96919e10286bf146407d2e71d4dbfab23
Signed-off-by: Conrad Groth <info@conrad-groth.de>

1 files changed, 76 insertions, 2 deletions

diff --git a/examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/controlexample/TreeTab.java b/examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/controlexample/TreeTab.java
index 542ae8e908..eea885b91b 100644
--- a/examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/controlexample/TreeTab.java
+++ b/examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/controlexample/TreeTab.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2016 IBM Corporation and others.
+ * Copyright (c) 2000, 2017 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
@@ -57,7 +57,9 @@ class TreeTab extends ScrollableTab {
 	static final int CELL_FOREGROUND_COLOR = 6;
 	static final int CELL_BACKGROUND_COLOR = 7;
 	static final int CELL_FONT = 8;
-	Color itemForegroundColor, itemBackgroundColor, cellForegroundColor, cellBackgroundColor;
+	static final int HEADER_FOREGROUND_COLOR = 9;
+	static final int HEADER_BACKGROUND_COLOR = 10;
+	Color itemForegroundColor, itemBackgroundColor, cellForegroundColor, cellBackgroundColor, headerForegroundColor, headerBackgroundColor;
 	Font itemFont, cellFont;
 
 	static String [] columnTitles	= {ControlExample.getResourceString("TableTitle_0"),
@@ -107,6 +109,10 @@ class TreeTab extends ScrollableTab {
 		item.setText(ControlExample.getResourceString ("Cell_Background_Color"));
 		item = new TableItem(colorAndFontTable, SWT.None);
 		item.setText(ControlExample.getResourceString ("Cell_Font"));
+		item = new TableItem(colorAndFontTable, SWT.None);
+		item.setText(ControlExample.getResourceString ("Header_Foreground_Color"));
+		item = new TableItem(colorAndFontTable, SWT.None);
+		item.setText(ControlExample.getResourceString ("Header_Background_Color"));
 
 		shell.addDisposeListener(event -> {
 			if (itemBackgroundColor != null) itemBackgroundColor.dispose();
@@ -115,12 +121,16 @@ class TreeTab extends ScrollableTab {
 			if (cellBackgroundColor != null) cellBackgroundColor.dispose();
 			if (cellForegroundColor != null) cellForegroundColor.dispose();
 			if (cellFont != null) cellFont.dispose();
+			if (headerBackgroundColor != null) headerBackgroundColor.dispose();
+			if (headerForegroundColor != null) headerForegroundColor.dispose();
 			itemBackgroundColor = null;
 			itemForegroundColor = null;
 			itemFont = null;
 			cellBackgroundColor = null;
 			cellForegroundColor = null;
 			cellFont = null;
+			headerForegroundColor = null;
+			headerBackgroundColor = null;
 		});
 	}
 
@@ -201,6 +211,29 @@ class TreeTab extends ScrollableTab {
 			if (oldFont != null) oldFont.dispose ();
 		}
 		break;
+		case HEADER_FOREGROUND_COLOR: {
+			Color oldColor = headerForegroundColor;
+			if (oldColor == null) oldColor = tree1.getHeaderForeground();
+			colorDialog.setRGB(oldColor.getRGB());
+			RGB rgb = colorDialog.open();
+			if (rgb == null) return;
+			oldColor = headerForegroundColor;
+			headerForegroundColor = new Color (display, rgb);
+			setHeaderForeground ();
+			if (oldColor != null) oldColor.dispose ();
+		}
+		break;
+		case HEADER_BACKGROUND_COLOR: {
+			Color oldColor = headerBackgroundColor;
+			if (oldColor == null) oldColor = tree1.getHeaderBackground();
+			colorDialog.setRGB(oldColor.getRGB());
+			RGB rgb = colorDialog.open();
+			if (rgb == null) return;
+			oldColor = headerBackgroundColor;
+			headerBackgroundColor = new Color (display, rgb);
+			setHeaderBackground ();
+			if (oldColor != null) oldColor.dispose ();
+		}
 		default:
 			super.changeFontOrColor(index);
 		}
@@ -492,6 +525,36 @@ class TreeTab extends ScrollableTab {
 		}
 	}
 
+	void setHeaderBackground () {
+		if (!instance.startup) {
+			tree1.setHeaderBackground (headerBackgroundColor);
+			tree2.setHeaderBackground (headerBackgroundColor);
+		}
+		/* Set the header background color item's image to match the header background color. */
+		Color color = headerBackgroundColor;
+ 		if (color == null) color = tree1.getHeaderBackground();
+		TableItem item = colorAndFontTable.getItem(HEADER_BACKGROUND_COLOR);
+		Image oldImage1 = item.getImage();
+		if (oldImage1 != null) oldImage1.dispose();
+		item.setImage (colorImage(color));
+
+	}
+
+	void setHeaderForeground () {
+		if (!instance.startup) {
+			tree1.setHeaderForeground (headerForegroundColor);
+			tree2.setHeaderForeground (headerForegroundColor);
+		}
+		/* Set the header foreground color item's image to match the header foreground color. */
+		Color color = headerForegroundColor;
+		if (color == null) color = tree1.getHeaderForeground();
+		TableItem item =  colorAndFontTable.getItem(HEADER_FOREGROUND_COLOR);
+		Image oldImage1 = item.getImage();
+		if (oldImage1 != null) oldImage1.dispose();
+		item.setImage (colorImage(color));
+
+	}
+
 	/**
 	 * Sets the moveable columns state of the "Example" widgets.
 	 */
@@ -555,6 +618,15 @@ class TreeTab extends ScrollableTab {
 		cellFont = null;
 		setCellFont ();
 		if (oldFont != null) oldFont.dispose();
+		oldColor = headerBackgroundColor;
+		headerBackgroundColor = null;
+		setHeaderBackground ();
+		if (oldColor != null) oldColor.dispose();
+		oldColor = headerForegroundColor;
+		headerForegroundColor = null;
+		setHeaderForeground ();
+		if (oldColor != null) oldColor.dispose();
+
 	}
 
 	/**
@@ -568,6 +640,8 @@ class TreeTab extends ScrollableTab {
 		setCellBackground ();
 		setCellForeground ();
 		setCellFont ();
+		setHeaderBackground ();
+		setHeaderForeground ();
 		if (!instance.startup) {
 			setColumnsMoveable ();
 			setColumnsResizable ();