/** * */ package org.gudy.azureus2.ui.swt; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.MouseListener; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.FontData; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Label; /** * A Label with a twistie graphic at the beginning; every time this label is clicked the * twistie graphic toggles between pointing to the right and pointing down. * * @author knguyen * */ public class TwistieLabel extends Composite implements ITwistieConstants { private int style = NONE; /** * An array of points for a triangle pointing downward */ static final int[] points_for_expanded = { 0, 2, 8, 2, 4, 6 }; /** * An array of points for a triangle pointing to the right * */ static final int[] points_for_collapsed = { 2, -1, 2, 8, 6, 4 }; /** * <code>Label</code> to display the text for this twistie */ private Label titleLabel = null; /** * The <code>Color</code> to use for the twistie graphic itself; * defaults to the same as the foreground color of the titleLabel */ private Color twistieColor = null; /** * The state of the control; callers can check this state by calling {@link #isCollapsed()} */ private boolean isCollapsed = true; /** * An optional Label to display the description */ private Label descriptionLabel = null; private List listeners = new ArrayList(); /** * Create a twistie Label with the given style bit. * <p>Style bit can be one or more of:</p> * <ul> * <li> TwistieLabel.NONE</li> -- The default; does not show description and separator, and is collapsed * <li> TwistieLabel.SHOW_DESCRIPTION</li> -- Show the description below the separator (or title if separator s not shown) * <li> TwistieLabel.SHOW_SEPARATOR</li> -- Show a separator below the title * <li> TwistieLabel.SHOW_EXPANDED</li> -- Show a separator below the title * </ul> * * @param parent * @param style */ public TwistieLabel(Composite parent, int style) { super(parent, SWT.NONE); this.style = style; GridLayout gLayout = new GridLayout(); gLayout.marginHeight = 0; gLayout.marginWidth = 0; gLayout.verticalSpacing = 0; gLayout.horizontalSpacing = 0; setLayout(gLayout); titleLabel = new Label(this, SWT.NONE); if ((this.style & SHOW_SEPARATOR) != 0) { Label separator = new Label(this, SWT.SEPARATOR | SWT.HORIZONTAL); GridData labelData = new GridData(SWT.FILL, SWT.CENTER, true, false); labelData.horizontalIndent = 10; separator.setLayoutData(labelData); } if ((this.style & SHOW_DESCRIPTION) != 0) { descriptionLabel = new Label(this, SWT.WRAP); GridData labelData = new GridData(SWT.FILL, SWT.FILL, true, false); labelData.horizontalIndent = 10; descriptionLabel.setLayoutData(labelData); /* * Change the font to be italic for the description */ Font initialFont = descriptionLabel.getFont(); FontData[] fontData = initialFont.getFontData(); for (int i = 0; i < fontData.length; i++) { fontData[i].setStyle(fontData[i].getStyle() | SWT.ITALIC); } descriptionLabel.setFont(new Font(getDisplay(), fontData)); } if ((this.style & SHOW_EXPANDED) != 0) { isCollapsed = false; } /* * Leaving a little margin on the left; this is where we draw the twistie graphic */ GridData labelData = new GridData(SWT.FILL, SWT.CENTER, true, false); labelData.horizontalIndent = 10; titleLabel.setLayoutData(labelData); /* * Defaults to the parent's background color */ setBackground(parent.getBackground()); /* * Add our mouse interceptor to the control and the title label */ MouseInterceptor interceptor = new MouseInterceptor(); super.addMouseListener(interceptor); titleLabel.addMouseListener(interceptor); /* * Listens to the paint event and do the drawing here */ addPaintListener(new PaintListener() { public void paintControl(PaintEvent e) { /* * The graphic is drawn to the left of the titleLabel so define the offset from the titleLabel */ int offsetX = titleLabel.getBounds().x - 10; int offsetY = titleLabel.getBounds().y + 3; if (null != twistieColor) { e.gc.setBackground(twistieColor); } else { e.gc.setBackground(getForeground()); } if (true == isCollapsed) { e.gc.fillPolygon(translate(points_for_collapsed, offsetX, offsetY)); } else { e.gc.fillPolygon(translate(points_for_expanded, offsetX, offsetY)); } } }); } /** * Translates the twistie points array to compensate for the given x and y offset * @param data * @param x * @param y * @return */ private int[] translate(int[] data, int x, int y) { int[] target = new int[data.length]; for (int i = 0; i < data.length; i += 2) { target[i] = data[i] + x; } for (int i = 1; i < data.length; i += 2) { target[i] = data[i] + y; } return target; } /** * Add a mouse listener to the control and also the <code>titleLabel</code> */ public void addMouseListener(MouseListener listener) { if (null != titleLabel) { titleLabel.addMouseListener(listener); } super.addMouseListener(listener); } /** * Remove the mouse listener from the control and also the <code>titleLabel</code> */ public void removeMouseListener(MouseListener listener) { if (null != titleLabel) { titleLabel.removeMouseListener(listener); } super.removeMouseListener(listener); } /** * Sets the color to be used for drawing the twistie graphic * @param color */ public void setTwistieForeground(Color color) { twistieColor = color; } /** * Sets the foreground color for the control and also all the text-base children */ public void setForeground(Color color) { if (null != titleLabel && false == titleLabel.isDisposed()) { titleLabel.setForeground(color); } if (null != descriptionLabel && false == descriptionLabel.isDisposed()) { descriptionLabel.setForeground(color); } if (null == twistieColor) { twistieColor = color; } super.setForeground(color); } /** * Sets the background color for the control and also all the text-base children */ public void setBackground(Color color) { if (null != titleLabel) { titleLabel.setBackground(color); } if (null != descriptionLabel) { descriptionLabel.setBackground(color); } super.setBackground(color); } /** * Sets the text to display as the title * @param string */ public void setTitle(String string) { if (null != titleLabel) { titleLabel.setText(string); } } /** * Sets the text to display as the description; this is not in effect unless the {@link #SHOW_DESCRIPTION} flag is also set * @param string */ public void setDescription(String string) { if (null != descriptionLabel) { descriptionLabel.setText(string); } } /** * Sets the tooltip for the control and also all the text-base children */ public void setToolTipText(String string) { if (null != titleLabel) { titleLabel.setToolTipText(string); } if (null != descriptionLabel) { descriptionLabel.setToolTipText(string); } super.setToolTipText(string); } /** * Sets the enablement for the control and also all the text-base children */ public void setEnabled(boolean enabled) { if (null != titleLabel) { titleLabel.setEnabled(enabled); } super.setEnabled(enabled); } /** * Returns whether this control is in a collapsed state * @return */ public boolean isCollapsed() { return isCollapsed; } /** * Add a listener to be notified whenever this control is collapsed or expanded; listeners * can check the collapsed/expanded state on the control and perform layout changes if need be. * @param listener */ public void addTwistieListener(ITwistieListener listener) { listeners.add(listener); } public void removeTwistieListener(ITwistieListener listener) { listeners.remove(listener); } private void notifyTwistieListeners() { for (Iterator iterator = listeners.iterator(); iterator.hasNext();) { ((ITwistieListener) iterator.next()).isCollapsed(isCollapsed()); } } /** * A listener that intercepts mouseDown events from the control and the title label so we can * fire a single event to the listener to signal that the control has been collapsed or expanded. * * * @author knguyen * */ private class MouseInterceptor extends MouseAdapter { /* * Listens to the mouse click and toggle the isCollapsed flag then force a redraw to update the control */ public void mouseDown(MouseEvent e) { isCollapsed = !isCollapsed; redraw(); notifyTwistieListeners(); } } }