/**
* Given a label figure object, this will calculate the correct Font needed to display into screen
* coordinates, taking into account the current mapmode. This will typically be used by direct
* edit cell editors that need to display independent of the zoom or any coordinate mapping that
* is taking place on the drawing surface.
*
* @param label the label to use for the font calculation
* @return the <code>Font</code> that is scaled to the screen coordinates. Note: the returned
* <code>Font</code> should not be disposed since it is cached by a common resource manager.
*/
protected Font getScaledFont(IFigure label) {
Font scaledFont = label.getFont();
FontData data = scaledFont.getFontData()[0];
Dimension fontSize = new Dimension(0, MapModeUtil.getMapMode(label).DPtoLP(data.getHeight()));
label.translateToAbsolute(fontSize);
if (Math.abs(data.getHeight() - fontSize.height) < 2) fontSize.height = data.getHeight();
try {
FontDescriptor fontDescriptor = FontDescriptor.createFrom(data);
cachedFontDescriptors.add(fontDescriptor);
return getResourceManager().createFont(fontDescriptor);
} catch (DeviceResourceException e) {
Trace.catching(
DiagramUIPlugin.getInstance(),
DiagramUIDebugOptions.EXCEPTIONS_CATCHING,
getClass(),
"getScaledFont",
e); //$NON-NLS-1$
Log.error(
DiagramUIPlugin.getInstance(),
DiagramUIStatusCodes.IGNORED_EXCEPTION_WARNING,
"getScaledFont",
e); //$NON-NLS-1$
}
return JFaceResources.getDefaultFont();
}
public void show() {
super.show();
IFigure fig = getEditPart().getFigure();
Control control = getCellEditor().getControl();
this.zoomLevelFont = getZoomLevelFont(fig.getFont(), control.getDisplay());
control.setFont(this.zoomLevelFont);
// since the font's have been resized, we need to resize the Text
// control...
getLocator().relocate(getCellEditor());
}