| package org.eclipse.jface.preference; |
| |
| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved. |
| */ |
| |
| import org.eclipse.jface.dialogs.IDialogConstants; |
| import org.eclipse.jface.resource.JFaceResources; |
| import org.eclipse.jface.resource.StringConverter; |
| import org.eclipse.jface.util.Assert; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.events.*; |
| import org.eclipse.swt.graphics.Font; |
| import org.eclipse.swt.graphics.FontData; |
| import org.eclipse.swt.layout.GridData; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * A field editor for a font type preference. |
| */ |
| public class FontFieldEditor extends FieldEditor { |
| |
| /** |
| * The change font button, or <code>null</code> if none |
| * (before creation and after disposal). |
| */ |
| private Button changeFontButton = null; |
| |
| /** |
| * The text for the change font button, or <code>null</code> |
| * if missing. |
| */ |
| private String changeButtonText; |
| |
| /** |
| * Font data for the chosen font button, or <code>null</code> if none. |
| */ |
| private FontData[] chosenFont; |
| |
| /** |
| * The label that displays the selected font, or <code>null</code> if none. |
| */ |
| private Label valueControl; |
| |
| /** |
| * The previewer, or <code>null</code> if none. |
| */ |
| private DefaultPreviewer previewer; |
| |
| /** |
| * Internal font previewer implementation. |
| */ |
| private static class DefaultPreviewer { |
| private Text text; |
| private String string; |
| private Font font; |
| public DefaultPreviewer(String s, Composite parent) { |
| string= s; |
| text= new Text(parent, SWT.READ_ONLY | SWT.BORDER); |
| text.addDisposeListener(new DisposeListener() { |
| public void widgetDisposed(DisposeEvent e) { |
| if (font != null) |
| font.dispose(); |
| } |
| }); |
| if (string != null) |
| text.setText(string); |
| } |
| |
| public Control getControl() { |
| return text; |
| } |
| |
| public void setFont(FontData[] fontData) { |
| if (font != null) |
| font.dispose(); |
| font= new Font(text.getDisplay(), fontData); |
| text.setFont(font); |
| } |
| public int getPreferredHeight() { |
| return 60; |
| } |
| } |
| /** |
| * Creates a new font field editor |
| */ |
| protected FontFieldEditor() { |
| } |
| /** |
| * Creates a font field editor with a preview window. |
| * |
| * @param name the name of the preference this field editor works on |
| * @param labelText the label text of the field editor |
| * @param previewText the text used for the preview window |
| * @param parent the parent of the field editor's control |
| */ |
| public FontFieldEditor(String name, String labelText, String previewText, Composite parent) { |
| this(name,labelText,parent); |
| Assert.isNotNull(previewText); |
| previewer = new DefaultPreviewer(previewText, parent); |
| |
| } |
| /** |
| * Creates a font field editor without a preview. |
| * |
| * @param name the name of the preference this field editor works on |
| * @param labelText the label text of the field editor |
| * @param parent the parent of the field editor's control |
| */ |
| public FontFieldEditor(String name, String labelText, Composite parent) { |
| init(name, labelText); |
| changeButtonText = JFaceResources.getString("openChange");//$NON-NLS-1$ |
| createControl(parent); |
| } |
| /* (non-Javadoc) |
| * Method declared on FieldEditor. |
| */ |
| protected void adjustForNumColumns(int numColumns) { |
| ((GridData)valueControl.getLayoutData()).horizontalSpan = numColumns - 2; |
| Control control = getPreviewControl(); |
| if (control != null) { |
| ((GridData)control.getLayoutData()).horizontalSpan = numColumns; |
| } |
| } |
| /* (non-Javadoc) |
| * Method declared on FieldEditor. |
| */ |
| protected void applyFont() { |
| if (chosenFont != null && previewer != null) |
| previewer.setFont(chosenFont); |
| } |
| /* (non-Javadoc) |
| * Method declared on FieldEditor. |
| */ |
| protected void doFillIntoGrid(Composite parent, int numColumns) { |
| Control control = getLabelControl(parent); |
| |
| valueControl = getValueControl(parent); |
| GridData gd = new GridData(GridData.FILL_HORIZONTAL); |
| gd.horizontalSpan = numColumns - 2; |
| valueControl.setLayoutData(gd); |
| |
| changeFontButton = getChangeControl(parent); |
| gd = new GridData(); |
| gd.horizontalAlignment = GridData.FILL; |
| gd.heightHint = convertVerticalDLUsToPixels(changeFontButton, IDialogConstants.BUTTON_HEIGHT); |
| int widthHint = convertHorizontalDLUsToPixels(changeFontButton, IDialogConstants.BUTTON_WIDTH); |
| gd.widthHint = Math.max(widthHint, changeFontButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); |
| changeFontButton.setLayoutData(gd); |
| |
| control = getPreviewControl(); |
| if (control != null) { |
| gd = new GridData(); |
| gd.horizontalAlignment = GridData.FILL; |
| gd.horizontalSpan = numColumns; |
| gd.heightHint = previewer.getPreferredHeight(); |
| control.setLayoutData(gd); |
| } |
| } |
| /* (non-Javadoc) |
| * Method declared on FieldEditor. |
| */ |
| protected void doLoad() { |
| if (changeFontButton == null) |
| return; |
| updateFont(PreferenceConverter.getFontDataArray(getPreferenceStore(), getPreferenceName())); |
| } |
| /* (non-Javadoc) |
| * Method declared on FieldEditor. |
| */ |
| protected void doLoadDefault() { |
| if (changeFontButton == null) |
| return; |
| updateFont(PreferenceConverter.getDefaultFontDataArray(getPreferenceStore(), getPreferenceName())); |
| } |
| /* (non-Javadoc) |
| * Method declared on FieldEditor. |
| */ |
| protected void doStore() { |
| PreferenceConverter.setValue(getPreferenceStore(), getPreferenceName(), chosenFont); |
| } |
| /** |
| * Returns the change button for this field editor. |
| * |
| * @return the change button |
| */ |
| protected Button getChangeControl(Composite parent) { |
| if (changeFontButton == null) { |
| changeFontButton= new Button(parent, SWT.PUSH); |
| if(changeButtonText != null) |
| changeFontButton.setText(changeButtonText); |
| changeFontButton.addSelectionListener(new SelectionAdapter() { |
| public void widgetSelected(SelectionEvent event) { |
| FontDialog fontDialog= new FontDialog(changeFontButton.getShell()); |
| fontDialog.setFontData(chosenFont[0]); |
| FontData font= fontDialog.open(); |
| if (font != null) { |
| FontData[] oldFont= chosenFont; |
| setPresentsDefaultValue(false); |
| FontData[] newData = new FontData[1]; |
| newData[0] = font; |
| updateFont(newData); |
| fireValueChanged(VALUE, oldFont[0], font); |
| } |
| |
| } |
| }); |
| changeFontButton.addDisposeListener(new DisposeListener() { |
| public void widgetDisposed(DisposeEvent event) { |
| changeFontButton= null; |
| } |
| }); |
| changeFontButton.setFont(parent.getFont()); |
| setButtonLayoutData(changeFontButton); |
| } else { |
| checkParent(changeFontButton, parent); |
| } |
| return changeFontButton; |
| } |
| /* (non-Javadoc) |
| * Method declared on FieldEditor. |
| */ |
| public int getNumberOfControls() { |
| return 3; |
| } |
| /** |
| * Returns the preferred preview height. |
| * |
| * @return the height, or <code>-1</code> if no previewer |
| * is installed |
| */ |
| public int getPreferredPreviewHeight() { |
| if (previewer == null) |
| return -1; |
| return previewer.getPreferredHeight(); |
| } |
| /** |
| * Returns the preview control for this field editor. |
| * |
| * @return the preview control |
| */ |
| public Control getPreviewControl() { |
| if (previewer == null) |
| return null; |
| |
| return previewer.getControl(); |
| } |
| /** |
| * Returns the value control for this field editor. The value control |
| * displays the currently selected font name. |
| * |
| * @return the value control |
| */ |
| protected Label getValueControl(Composite parent) { |
| if (valueControl == null) { |
| valueControl = new Label(parent, SWT.LEFT); |
| valueControl.setFont(parent.getFont()); |
| valueControl.addDisposeListener(new DisposeListener() { |
| public void widgetDisposed(DisposeEvent event) { |
| valueControl = null; |
| } |
| }); |
| } else { |
| checkParent(valueControl, parent); |
| } |
| return valueControl; |
| } |
| /** |
| * Sets the text of the change button. |
| * |
| * @param text the new text |
| */ |
| public void setChangeButtonText(String text) { |
| Assert.isNotNull(text); |
| changeButtonText = text; |
| if (changeFontButton != null) |
| changeFontButton.setText(text); |
| } |
| /** |
| * Updates the change font button and the previewer to reflect the |
| * newly selected font. |
| */ |
| private void updateFont(FontData font[]) { |
| FontData[] bestFont = |
| JFaceResources.getFontRegistry(). |
| bestDataArray(font,valueControl.getDisplay()); |
| |
| //if we have nothing valid do as best we can |
| if(bestFont == null) |
| bestFont = getDefaultFontData(); |
| |
| //Now cache this value in the receiver |
| this.chosenFont = bestFont; |
| |
| if (valueControl != null) { |
| valueControl.setText(StringConverter.asString(chosenFont[0])); |
| } |
| if (previewer != null) { |
| previewer.setFont(bestFont); |
| } |
| } |
| /** |
| * Store the default preference for the field |
| * being edited |
| */ |
| protected void setToDefault(){ |
| FontData[] defaultFontData = |
| PreferenceConverter.getDefaultFontDataArray(getPreferenceStore(),getPreferenceName()); |
| PreferenceConverter.setValue( |
| getPreferenceStore(), |
| getPreferenceName(), |
| defaultFontData); |
| } |
| |
| /** |
| * Get the system default font data. |
| */ |
| private FontData[] getDefaultFontData(){ |
| return valueControl.getDisplay().getSystemFont().getFontData(); |
| } |
| |
| /* |
| * @see FieldEditor.setEnabled(boolean,Composite). |
| */ |
| public void setEnabled(boolean enabled, Composite parent){ |
| super.setEnabled(enabled,parent); |
| getChangeControl(parent).setEnabled(enabled); |
| getValueControl(parent).setEnabled(enabled); |
| } |
| |
| } |