r/org.eclipse.statet.r.ui/src/org/eclipse/statet/r/ui/graphics/RAlphaChooser.java - statet/org.eclipse.statet-r - Git at Google

 /*=============================================================================#
  # Copyright (c) 2013, 2020 Stephan Wahlbrink and others.
  #
  # This program and the accompanying materials are made available under the
  # terms of the Eclipse Public License 2.0 which is available at
  # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
  # which is available at https://www.apache.org/licenses/LICENSE-2.0.
  #
  # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
  #
  # Contributors:
  #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
  #=============================================================================*/

 package org.eclipse.statet.r.ui.graphics;

 import com.ibm.icu.text.DecimalFormat;

 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CTabFolder;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.GC;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Shell;

 import org.eclipse.statet.ecommons.graphics.core.ColorAlphaDef;
 import org.eclipse.statet.ecommons.graphics.core.ColorDef;
 import org.eclipse.statet.ecommons.ui.components.AlphaSelector;
 import org.eclipse.statet.ecommons.ui.components.DoubleText;
 import org.eclipse.statet.ecommons.ui.components.IObjValueListener;
 import org.eclipse.statet.ecommons.ui.components.ObjValueEvent;
 import org.eclipse.statet.ecommons.ui.dialogs.ToolPopup;
 import org.eclipse.statet.ecommons.ui.util.LayoutUtils;


 public class RAlphaChooser extends ToolPopup {


 	private static final String ALPHA = "Alpha"; //$NON-NLS-1$


 	public static void drawPreview(final GC gc,
 			final int x, final int y, final int width, final int height,
 			final Color color ) {
 		if (color != null) {
 			gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_WHITE));
 			gc.fillRectangle(x, y, width + 1, height + 1);
 			gc.setBackground(color);
 			final int b = 1 + height / 4;
 			gc.fillRectangle(x, y + b, width + 1, height + 1 - 2 * b);
 		}
 	}

 	public static Color createPreviewColor(final Display display, final ColorAlphaDef baseColor) {
 		return createPreviewColor(display, baseColor.getAlpha255(), baseColor);
 	}

 	public static Color createPreviewColor(final Display display, final int alpha255, final ColorDef baseColor) {
 		if (baseColor == null) {
 			return new Color(display, alpha255, alpha255, alpha255);
 		}
 		final int white = 255 - alpha255;
 		return new Color(display,
 				white + (baseColor.getRed() * alpha255) / 255,
 				white + (baseColor.getGreen() * alpha255) / 255,
 				white + (baseColor.getBlue() * alpha255) / 255 );
 	}


 	protected static abstract class AlphaTab extends ToolTab {


 		private final AlphaSelector fSelector;

 		private DoubleText fText;

 		private int fTextChange;

 		private final DecimalFormat fFormat = DoubleText.createFormat(3);


 		AlphaTab(final ToolPopup parent) {
 			this(parent, "Alpha", "Definition by Alpha [0, 1]"); //$NON-NLS-1$
 		}

 		AlphaTab(final ToolPopup parent, final String name, final String tooltip) {
 			super(ALPHA, parent, name, tooltip);

 			final Composite composite = create();
 			composite.setLayout(LayoutUtils.newTabGrid(3));

 			fSelector = new AlphaSelector(composite);
 			fSelector.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 2));

 			{	final IObjValueListener<Double> textListener = new IObjValueListener<Double>() {
 					@Override
 					public void valueAboutToChange(final ObjValueEvent<Double> event) {
 					}
 					@Override
 					public void valueChanged(final ObjValueEvent<Double> event) {
 						if (event.newValue == null) {
 							return;
 						}
 						final Float oldValue = fSelector.getValue(0);
 						fTextChange++;
 						try {
 							final Float value = Float.valueOf(event.newValue.floatValue());
 							if (!value.equals(oldValue)) {
 								fSelector.setValue(0, value);
 								setValue(value);
 							}
 						}
 						catch (final NumberFormatException e) {}
 						catch (final IllegalArgumentException e) {}
 						finally {
 							fTextChange--;
 						}
 						return;
 					}
 				};
 				{	final Label label = new Label(composite, SWT.NONE);
 					label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false));
 					label.setText("     &Alpha (opaque):");

 					final DoubleText text = new DoubleText(composite, SWT.BORDER);
 					final GridData gd = new GridData(SWT.FILL, SWT.CENTER, false, false);
 					gd.widthHint = LayoutUtils.hintWidth(text.getControl(), 6);
 					text.getControl().setLayoutData(gd);
 					text.addValueListener(textListener);

 					text.setIncrement(0.001);
 					text.setMinMax(0.0, 1.0);
 					text.setFormat(fFormat);

 					fText = text;
 				}
 			}
 			{	final Label label = new Label(composite, SWT.NONE);
 				final GridData gd = new GridData(SWT.FILL, SWT.FILL, false, true, 2, 1);
 				label.setLayoutData(gd);
 			}

 			fSelector.addValueListener(new IObjValueListener<Float>() {
 				@Override
 				public void valueAboutToChange(final ObjValueEvent<Float> event) {
 				}
 				@Override
 				public void valueChanged(final ObjValueEvent<Float> event) {
 					if (fTextChange == 0) {
 						final Float value = event.newValue;
 						fText.setValue(0, Double.valueOf(value.doubleValue()));
 						setValue(value);
 					}
 				}
 			});
 		}

 		public DecimalFormat getFormat() {
 			return fFormat;
 		}

 		@Override
 		protected void activated() {
 			fSelector.setBaseColor(getBaseColor());
 			final Float value = getValue();
 			fSelector.setValue(0, value);
 		}

 		protected abstract Float getValue();

 		protected abstract void setValue(Float value);

 		protected ColorDef getBaseColor() {
 			return null;
 		}

 	}


 	private Float fInitialValue;
 	private int fInitial255 = -1;
 	private Color fInitialSWTColor;
 	private Float fCurrentValue;
 	private int fCurrent255 = -1;
 	private Color fCurrentSWTColor;

 	private ColorDef fBaseColor;

 	private Composite fStatusControl;


 	public RAlphaChooser() {
 	}


 	public void open(final Shell parent, final Rectangle position, final Float initialValue) {
 		fInitialValue = initialValue;
 		if (initialValue != null) {
 			fInitial255 = 255 - Math.round(initialValue * 255);
 		}
 		doSetValue((initialValue != null) ? initialValue : Float.valueOf(1f));

 		super.open(parent, position);
 	}

 	@Override
 	protected void addTabs(final CTabFolder tabFolder) {
 		new AlphaTab(this) {
 			@Override
 			protected Float getValue() {
 				return RAlphaChooser.this.getValue();
 			}
 			@Override
 			protected void setValue(final Float value) {
 				RAlphaChooser.this.doSetValue(value);
 			}
 		};
 	}

 	@Override
 	protected ToolTab getBestTab() {
 		return getTab(ALPHA);
 	}

 	@Override
 	protected void addStatusControls(final Composite composite) {
 		fStatusControl = new PreviewCanvas(composite) {
 			@Override
 			protected void drawPreview(final GC gc, final int idx,
 					final int x, final int y, final int width, final int height) {
 				Color color = null;
 				switch (idx) {
 				case 0:
 					if (fInitialValue != null) {
 						if (fInitialSWTColor == null) {
 							fInitialSWTColor = createPreviewColor(getDisplay(), fInitial255, fBaseColor);
 						}
 						color = fInitialSWTColor;
 					}
 					break;
 				case 1:
 					if (fCurrentValue != null) {
 						if (fCurrentSWTColor == null) {
 							fCurrentSWTColor = createPreviewColor(getDisplay(), fCurrent255, fBaseColor);
 						}
 						color = fCurrentSWTColor;
 					}
 					break;
 				default:
 					break;
 				}
 				RAlphaChooser.drawPreview(gc, x, y, width, height, color);
 			}
 		};
 		updateStatus();
 	}

 	protected void doSetValue(final Float value) {
 		if (value == null || value.equals(fCurrentValue)) {
 			return;
 		}
 		final int v255 = 255 - Math.round(value * 255);
 		if (fCurrentSWTColor != null && v255 != fCurrent255) {
 			fCurrentSWTColor.dispose();
 			fCurrentSWTColor = null;
 		}
 		fCurrentValue = value;
 		fCurrent255 = v255;

 		if (fStatusControl != null) {
 			updateStatus();
 		}
 	}

 	protected void updateStatus() {
 		final StringBuilder sb = new StringBuilder();
 		final DecimalFormat format = ((AlphaTab) getTab(ALPHA)).getFormat();
 		sb.append("Previous: ");
 		sb.append((fInitialValue != null) ? format.format(fInitialValue) : "-"); //$NON-NLS-1$
 		sb.append("\n");
 		sb.append("Current: ");
 		sb.append(format.format(fCurrentValue));
 //		fStatusLabel.setText(info);
 		fStatusControl.setToolTipText(sb.toString());
 		fStatusControl.redraw();
 	}

 	public Float getValue() {
 		return fCurrentValue;
 	}

 	@Override
 	protected void onDispose() {
 		fStatusControl = null;
 		super.onDispose();
 		if (fInitialSWTColor != null) {
 			fInitialSWTColor.dispose();
 			fInitial255 = -1;
 			fInitialSWTColor = null;
 		}
 		if (fCurrentSWTColor != null) {
 			fCurrentSWTColor.dispose();
 			fCurrent255 = -1;
 			fCurrentSWTColor = null;
 		}
 	}

 }
	/*=============================================================================#
	# Copyright (c) 2013, 2020 Stephan Wahlbrink and others.
	#
	# This program and the accompanying materials are made available under the
	# terms of the Eclipse Public License 2.0 which is available at
	# https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
	# which is available at https://www.apache.org/licenses/LICENSE-2.0.
	#
	# SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
	#
	# Contributors:
	# Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
	#=============================================================================*/

	package org.eclipse.statet.r.ui.graphics;

	import com.ibm.icu.text.DecimalFormat;

	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.CTabFolder;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.GC;
	import org.eclipse.swt.graphics.Rectangle;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Shell;

	import org.eclipse.statet.ecommons.graphics.core.ColorAlphaDef;
	import org.eclipse.statet.ecommons.graphics.core.ColorDef;
	import org.eclipse.statet.ecommons.ui.components.AlphaSelector;
	import org.eclipse.statet.ecommons.ui.components.DoubleText;
	import org.eclipse.statet.ecommons.ui.components.IObjValueListener;
	import org.eclipse.statet.ecommons.ui.components.ObjValueEvent;
	import org.eclipse.statet.ecommons.ui.dialogs.ToolPopup;
	import org.eclipse.statet.ecommons.ui.util.LayoutUtils;


	public class RAlphaChooser extends ToolPopup {


	private static final String ALPHA = "Alpha"; //$NON-NLS-1$


	public static void drawPreview(final GC gc,
	final int x, final int y, final int width, final int height,
	final Color color ) {
	if (color != null) {
	gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_WHITE));
	gc.fillRectangle(x, y, width + 1, height + 1);
	gc.setBackground(color);
	final int b = 1 + height / 4;
	gc.fillRectangle(x, y + b, width + 1, height + 1 - 2 * b);
	}
	}

	public static Color createPreviewColor(final Display display, final ColorAlphaDef baseColor) {
	return createPreviewColor(display, baseColor.getAlpha255(), baseColor);
	}

	public static Color createPreviewColor(final Display display, final int alpha255, final ColorDef baseColor) {
	if (baseColor == null) {
	return new Color(display, alpha255, alpha255, alpha255);
	}
	final int white = 255 - alpha255;
	return new Color(display,
	white + (baseColor.getRed() * alpha255) / 255,
	white + (baseColor.getGreen() * alpha255) / 255,
	white + (baseColor.getBlue() * alpha255) / 255 );
	}


	protected static abstract class AlphaTab extends ToolTab {


	private final AlphaSelector fSelector;

	private DoubleText fText;

	private int fTextChange;

	private final DecimalFormat fFormat = DoubleText.createFormat(3);


	AlphaTab(final ToolPopup parent) {
	this(parent, "Alpha", "Definition by Alpha [0, 1]"); //$NON-NLS-1$
	}

	AlphaTab(final ToolPopup parent, final String name, final String tooltip) {
	super(ALPHA, parent, name, tooltip);

	final Composite composite = create();
	composite.setLayout(LayoutUtils.newTabGrid(3));

	fSelector = new AlphaSelector(composite);
	fSelector.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 2));

	{ final IObjValueListener<Double> textListener = new IObjValueListener<Double>() {
	@Override
	public void valueAboutToChange(final ObjValueEvent<Double> event) {
	}
	@Override
	public void valueChanged(final ObjValueEvent<Double> event) {
	if (event.newValue == null) {
	return;
	}
	final Float oldValue = fSelector.getValue(0);
	fTextChange++;
	try {
	final Float value = Float.valueOf(event.newValue.floatValue());
	if (!value.equals(oldValue)) {
	fSelector.setValue(0, value);
	setValue(value);
	}
	}
	catch (final NumberFormatException e) {}
	catch (final IllegalArgumentException e) {}
	finally {
	fTextChange--;
	}
	return;
	}
	};
	{ final Label label = new Label(composite, SWT.NONE);
	label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false));
	label.setText(" &Alpha (opaque):");

	final DoubleText text = new DoubleText(composite, SWT.BORDER);
	final GridData gd = new GridData(SWT.FILL, SWT.CENTER, false, false);
	gd.widthHint = LayoutUtils.hintWidth(text.getControl(), 6);
	text.getControl().setLayoutData(gd);
	text.addValueListener(textListener);

	text.setIncrement(0.001);
	text.setMinMax(0.0, 1.0);
	text.setFormat(fFormat);

	fText = text;
	}
	}
	{ final Label label = new Label(composite, SWT.NONE);
	final GridData gd = new GridData(SWT.FILL, SWT.FILL, false, true, 2, 1);
	label.setLayoutData(gd);
	}

	fSelector.addValueListener(new IObjValueListener<Float>() {
	@Override
	public void valueAboutToChange(final ObjValueEvent<Float> event) {
	}
	@Override
	public void valueChanged(final ObjValueEvent<Float> event) {
	if (fTextChange == 0) {
	final Float value = event.newValue;
	fText.setValue(0, Double.valueOf(value.doubleValue()));
	setValue(value);
	}
	}
	});
	}

	public DecimalFormat getFormat() {
	return fFormat;
	}

	@Override
	protected void activated() {
	fSelector.setBaseColor(getBaseColor());
	final Float value = getValue();
	fSelector.setValue(0, value);
	}

	protected abstract Float getValue();

	protected abstract void setValue(Float value);

	protected ColorDef getBaseColor() {
	return null;
	}

	}


	private Float fInitialValue;
	private int fInitial255 = -1;
	private Color fInitialSWTColor;
	private Float fCurrentValue;
	private int fCurrent255 = -1;
	private Color fCurrentSWTColor;

	private ColorDef fBaseColor;

	private Composite fStatusControl;


	public RAlphaChooser() {
	}


	public void open(final Shell parent, final Rectangle position, final Float initialValue) {
	fInitialValue = initialValue;
	if (initialValue != null) {
	fInitial255 = 255 - Math.round(initialValue * 255);
	}
	doSetValue((initialValue != null) ? initialValue : Float.valueOf(1f));

	super.open(parent, position);
	}

	@Override
	protected void addTabs(final CTabFolder tabFolder) {
	new AlphaTab(this) {
	@Override
	protected Float getValue() {
	return RAlphaChooser.this.getValue();
	}
	@Override
	protected void setValue(final Float value) {
	RAlphaChooser.this.doSetValue(value);
	}
	};
	}

	@Override
	protected ToolTab getBestTab() {
	return getTab(ALPHA);
	}

	@Override
	protected void addStatusControls(final Composite composite) {
	fStatusControl = new PreviewCanvas(composite) {
	@Override
	protected void drawPreview(final GC gc, final int idx,
	final int x, final int y, final int width, final int height) {
	Color color = null;
	switch (idx) {
	case 0:
	if (fInitialValue != null) {
	if (fInitialSWTColor == null) {
	fInitialSWTColor = createPreviewColor(getDisplay(), fInitial255, fBaseColor);
	}
	color = fInitialSWTColor;
	}
	break;
	case 1:
	if (fCurrentValue != null) {
	if (fCurrentSWTColor == null) {
	fCurrentSWTColor = createPreviewColor(getDisplay(), fCurrent255, fBaseColor);
	}
	color = fCurrentSWTColor;
	}
	break;
	default:
	break;
	}
	RAlphaChooser.drawPreview(gc, x, y, width, height, color);
	}
	};
	updateStatus();
	}

	protected void doSetValue(final Float value) {
	if (value == null \|\| value.equals(fCurrentValue)) {
	return;
	}
	final int v255 = 255 - Math.round(value * 255);
	if (fCurrentSWTColor != null && v255 != fCurrent255) {
	fCurrentSWTColor.dispose();
	fCurrentSWTColor = null;
	}
	fCurrentValue = value;
	fCurrent255 = v255;

	if (fStatusControl != null) {
	updateStatus();
	}
	}

	protected void updateStatus() {
	final StringBuilder sb = new StringBuilder();
	final DecimalFormat format = ((AlphaTab) getTab(ALPHA)).getFormat();
	sb.append("Previous: ");
	sb.append((fInitialValue != null) ? format.format(fInitialValue) : "-"); //$NON-NLS-1$
	sb.append("\n");
	sb.append("Current: ");
	sb.append(format.format(fCurrentValue));
	// fStatusLabel.setText(info);
	fStatusControl.setToolTipText(sb.toString());
	fStatusControl.redraw();
	}

	public Float getValue() {
	return fCurrentValue;
	}

	@Override
	protected void onDispose() {
	fStatusControl = null;
	super.onDispose();
	if (fInitialSWTColor != null) {
	fInitialSWTColor.dispose();
	fInitial255 = -1;
	fInitialSWTColor = null;
	}
	if (fCurrentSWTColor != null) {
	fCurrentSWTColor.dispose();
	fCurrent255 = -1;
	fCurrentSWTColor = null;
	}
	}

	}