/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/package org.eclipse.swt.graphics;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.SWTException;
/**
* Instances of this class manage operating system resources that
* define how text looks when it is displayed. Fonts may be constructed
* by providing a device and either name, size and style information
* or a <code>FontData</code> object which encapsulates this data.
* <p>
* Application code must explicitly invoke the <code>Font.dispose()</code>
* method to release the operating system resources managed by each instance
* when those instances are no longer required.
* </p>
*
* @see FontData
*/
public final class Font extends Resource {
/**
* the handle to the OS font resource
* (Warning: This field is platform dependent)
* <p>
* <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
* public API. It is marked public only so that it can be shared
* within the packages provided by SWT. It is not available on all
* platforms and should never be accessed from application code.
* </p>
*/
//public int handle;
public FontData data;
/**
* Prevents uninitialized instances from being created outside the package.
*/
Font() {
}
/**
* Constructs a new font given a device and font data
* which describes the desired font's appearance.
* <p>
* You must dispose the font when it is no longer required.
* </p>
*
* @param device the device to create the font on
* @param fd the FontData that describes the desired font (must not be null)
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
* <li>ERROR_NULL_ARGUMENT - if the fd argument is null</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li>
* </ul>
*/
public Font(Device device, FontData fd) {
if (device == null)
device = Device.getDevice();
if (device == null)
SWT.error(SWT.ERROR_NULL_ARGUMENT);
init(device, fd);
// if (device.tracking) device.new_Object(this);
}
/**
* Constructs a new font given a device and an array
* of font data which describes the desired font's
* appearance.
* <p>
* You must dispose the font when it is no longer required.
* </p>
*
* @param device the device to create the font on
* @param fds the array of FontData that describes the desired font (must not be null)
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
* <li>ERROR_NULL_ARGUMENT - if the fds argument is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the length of fds is zero</li>
* <li>ERROR_NULL_ARGUMENT - if any fd in the array is null</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li>
* </ul>
*
* @since 2.1
*/
public Font(Device device, FontData[] fds) {
if (device == null)
device = Device.getDevice();
if (device == null)
SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (fds == null)
SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (fds.length == 0)
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
for (int i = 0; i < fds.length; i++) {
if (fds[i] == null)
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
init(device, fds[0]);
//if (device.tracking) device.new_Object(this);
}
/**
* Constructs a new font given a device, a font name,
* the height of the desired font in points, and a font
* style.
* <p>
* You must dispose the font when it is no longer required.
* </p>
*
* @param device the device to create the font on
* @param name the name of the font (must not be null)
* @param height the font height in points
* @param style a bit or combination of NORMAL, BOLD, ITALIC
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
* <li>ERROR_NULL_ARGUMENT - if the name argument is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the height is negative</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES - if a font could not be created from the given arguments</li>
* </ul>
*/
public Font(Device device, String name, int height, int style) {
if (device == null)
device = Device.getDevice();
if (device == null)
SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (name == null)
SWT.error(SWT.ERROR_NULL_ARGUMENT);
init(device, new FontData(name, height, style));
// if (device.tracking) device.new_Object(this);
}
/**
* Disposes of the operating system resources associated with
* the font. Applications must dispose of all fonts which
* they allocate.
*/
public void dispose() {
data = null;
/*
if (handle == 0) return;
if (device.isDisposed()) return;
OS.DeleteObject(handle);
handle = 0;
if (device.tracking) device.dispose_Object(this);
*/
device = null;
}
/**
* Compares the argument to the receiver, and returns true
* if they represent the <em>same</em> object using a class
* specific comparison.
*
* @param object the object to compare with this object
* @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
*
* @see #hashCode
*/
public boolean equals(Object object) {
if (object == this )
return true;
if (!(object instanceof Font))
return false;
Font font = (Font) object;
return /*device == font.device && */font.data.equals(data);
}
/**
* Returns an array of <code>FontData</code>s representing the receiver.
* On Windows, only one FontData will be returned per font. On X however,
* a <code>Font</code> object <em>may</em> be composed of multiple X
* fonts. To support this case, we return an array of font data objects.
*
* @return an array of font data objects describing the receiver
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public FontData[] getFontData() {
if (isDisposed())
SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
// LOGFONT logFont = OS.IsUnicode ? (LOGFONT)new LOGFONTW() : new LOGFONTA();
// OS.GetObject(handle, LOGFONT.sizeof, logFont);
// return new FontData[] {FontData.win32_new(logFont, device.computePoints(logFont, handle))};
//return null;
FontData[] datum = new FontData[1];
datum[0] = data;
//return new FontData[] { data };
return datum;
}
/**
* Returns an integer hash code for the receiver. Any two
* objects that return <code>true</code> when passed to
* <code>equals</code> must return the same value for this
* method.
*
* @return the receiver's hash
*
* @see #equals
*/
public int hashCode() {
return data.hashCode();
}
void init(Device device, FontData fd) {
data = fd;
if (fd == null)
SWT.error(SWT.ERROR_NULL_ARGUMENT);
this .device = device;
/*
LOGFONT logFont = fd.data;
int lfHeight = logFont.lfHeight;
logFont.lfHeight = device.computePixels(fd.height);
handle = OS.CreateFontIndirect(logFont);
logFont.lfHeight = lfHeight;
if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
*/
}
/**
* Returns <code>true</code> if the font has been disposed,
* and <code>false</code> otherwise.
* <p>
* This method gets the dispose state for the font.
* When a font has been disposed, it is an error to
* invoke any other method using the font.
*
* @return <code>true</code> when the font is disposed and <code>false</code> otherwise
*/
public boolean isDisposed() {
// return false;
return data == null;
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the receiver
*/
public String toString() {
if (isDisposed())
return "Font {*DISPOSED*}";
return "Font {" + data + "}";
}
/*
/**
* Invokes platform specific functionality to allocate a new font.
* <p>
* <b>IMPORTANT:</b> This method is <em>not</em> part of the public
* API for <code>Font</code>. It is marked public only so that it
* can be shared within the packages provided by SWT. It is not
* available on all platforms, and should never be called from
* application code.
* </p>
*
* @param device the device on which to allocate the color
* @param handle the handle for the font
* @return a new font object containing the specified device and handle
*-/
public static Font win32_new(Device device, int handle) {
if (device == null) device = Device.getDevice();
Font font = new Font();
//font.handle = handle;
font.device = device;
return font;
}
*/
}
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