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package org.eclipse.swt.graphics;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved
*/
import org.eclipse.swt.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.widgets.*;
/**
* 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 {
/**
* the handle to the OS font resource
* (Warning: This field is platform dependent)
*/
public int handle;
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 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 display, FontData fd) {
if (fd == null) error(SWT.ERROR_NULL_ARGUMENT);
String xlfd = fd.getXlfd();
byte[] buffer = Converter.wcsToMbcs(null, xlfd, true);
handle = OS.gdk_font_load(buffer);
if (handle == 0) {
int hStyle = OS.gtk_widget_get_default_style();
GtkStyle gtkStyle = new GtkStyle();
OS.memmove(gtkStyle, hStyle, GtkStyle.sizeof);
handle = OS.gdk_font_ref(gtkStyle.font);
}
}
/**
* 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 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 display, String fontFamily, int height, int style) {
if (fontFamily == null) error(SWT.ERROR_NULL_ARGUMENT);
FontData fd = new FontData(fontFamily, height, style);
byte[] buffer = Converter.wcsToMbcs(null, fd.getXlfd(), true);
handle = OS.gdk_font_load(buffer);
if (handle == 0) {
int hStyle = OS.gtk_widget_get_default_style();
GtkStyle gtkStyle = new GtkStyle();
OS.memmove(gtkStyle, hStyle, GtkStyle.sizeof);
handle = OS.gdk_font_ref(gtkStyle.font);
}
}
/**
* Disposes of the operating system resources associated with
* the font. Applications must dispose of all fonts which
* they allocate.
*/
public void dispose() {
if (handle != 0) OS.gdk_font_unref(handle);
handle = 0;
}
/**
* 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;
return OS.gdk_font_equal(handle, ((Font)object).handle);
}
void error(int code) {
throw new SWTError (code);
}
/**
* 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() {
int index=0;
int fnames = getFontNameList(handle);
int nfonts = OS.g_slist_length(fnames);
FontData[] answer = new FontData[nfonts];
for (int i=0; i<nfonts; i++) {
FontData data = new FontData();
int name = OS.g_slist_nth_data(fnames, index);
int length = OS.strlen(name);
byte [] buffer1 = new byte[length];
OS.memmove(buffer1, name, length);
char [] buffer2 = Converter.mbcsToWcs (null, buffer1);
String fontname = new String (buffer2, 0, buffer2.length);
data.setXlfd(fontname);
// Wild guess, 'a' looks average enough
data.averageWidth = OS.gdk_char_width(handle, (byte)'a');
// Wild guess, a progressive font should probably have A wider than l
int widthA = OS.gdk_char_width(handle, (byte)'A');
int widthl = OS.gdk_char_width(handle, (byte)'l');
if (widthA == widthl) data.spacing = "m";
else data.spacing = "p";
answer[i] = data;
}
return answer;
}
static int getFontNameList(int handle) {
int[] mem = new int[7];
OS.memmove(mem, handle, 7*4);
int type = mem[0];
int ascent = mem[1];
int descent = mem[2];
int xfont =mem [3];
int xdisplay = mem[4];
int ref_count = mem[5];
int names = mem[6];
return names;
}
public static Font gtk_new(int handle) {
Font font = new Font();
font.handle = handle;
return font;
}
/**
* Returns an integer hash code for the receiver. Any two
* objects which 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 handle;
}
/**
* 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 handle == 0;
}
/**
* 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 {" + handle + "}";
}
}
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