Example usage for org.eclipse.swt.graphics FontData FontData

Introduction

In this page you can find the example usage for org.eclipse.swt.graphics FontData FontData.

Prototype

public FontData() 

Source Link

Document

Constructs a new uninitialized font data.

Usage

From source file:SWTUtils.java

/**
 * Create a <code>FontData</code> object which encapsulate
 * the essential data to create a swt font. The data is taken
 * from the provided awt Font./*from w  w  w  .  ja  v  a 2s.c  om*/
 * <p>Generally speaking, given a font size, the returned swt font
 * will display differently on the screen than the awt one.
 * Because the SWT toolkit use native graphical resources whenever
 * it is possible, this fact is platform dependent. To address
 * this issue, it is possible to enforce the method to return
 * a font with the same size (or at least as close as possible)
 * as the awt one.
 * <p>When the object is no more used, the user must explicitly
 * call the dispose method on the returned font to free the
 * operating system resources (the garbage collector won't do it).
 *
 * @param device The swt device to draw on (display or gc device).
 * @param font The awt font from which to get the data.
 * @param ensureSameSize A boolean used to enforce the same size
 * (in pixels) between the awt font and the newly created swt font.
 * @return a <code>FontData</code> object.
 */
public static FontData toSwtFontData(Device device, java.awt.Font font, boolean ensureSameSize) {
    FontData fontData = new FontData();
    fontData.setName(font.getFamily());
    // SWT and AWT share the same style constants.
    fontData.setStyle(font.getStyle());
    // convert the font size (in pt for awt) to height in pixels for swt
    int height = (int) Math.round(font.getSize() * 72.0 / device.getDPI().y);
    fontData.setHeight(height);
    // hack to ensure the newly created swt fonts will be rendered with the
    // same height as the awt one
    if (ensureSameSize) {
        GC tmpGC = new GC(device);
        Font tmpFont = new Font(device, fontData);
        tmpGC.setFont(tmpFont);
        if (tmpGC.textExtent(Az).x > DUMMY_PANEL.getFontMetrics(font).stringWidth(Az)) {
            while (tmpGC.textExtent(Az).x > DUMMY_PANEL.getFontMetrics(font).stringWidth(Az)) {
                tmpFont.dispose();
                height--;
                fontData.setHeight(height);
                tmpFont = new Font(device, fontData);
                tmpGC.setFont(tmpFont);
            }
        } else if (tmpGC.textExtent(Az).x < DUMMY_PANEL.getFontMetrics(font).stringWidth(Az)) {
            while (tmpGC.textExtent(Az).x < DUMMY_PANEL.getFontMetrics(font).stringWidth(Az)) {
                tmpFont.dispose();
                height++;
                fontData.setHeight(height);
                tmpFont = new Font(device, fontData);
                tmpGC.setFont(tmpFont);
            }
        }
        tmpFont.dispose();
        tmpGC.dispose();
    }
    return fontData;
}

---