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view dwt/graphics/Font.d @ 361:4bffbf81e2d6
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author | Frank Benoit <benoit@tionex.de> |
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date | Fri, 20 Mar 2009 21:00:06 +0100 |
parents | c0d810de7093 |
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/******************************************************************************* * Copyright (c) 2000, 2008 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 * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.graphics.Font; import dwt.dwthelper.utils; import dwt.DWT; import dwt.graphics.Resource; import dwt.graphics.FontData; import dwt.graphics.Device; import dwt.internal.Converter; import dwt.internal.gtk.OS; import tango.text.convert.Format; /** * 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 * @see <a href="http://www.eclipse.org/swt/snippets/#font">Font snippets</a> * @see <a href="http://www.eclipse.org/swt/examples.php">DWT Examples: GraphicsExample, PaintExample</a> * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> */ public final class Font : Resource { alias Resource.init_ init_; /** * 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 DWT * public API. It is marked public only so that it can be shared * within the packages provided by DWT. It is not available on all * platforms and should never be accessed from application code. * </p> */ public PangoFontDescription* handle; this(Device device) { super(device); } /** * 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 DWTError <ul> * <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li> * </ul> */ public this(Device device, FontData fd) { super(device); if (fd is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); init_(fd.getName(), fd.getHeightF(), fd.getStyle(), fd.str); init_(); } /** * 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 DWTError <ul> * <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li> * </ul> * * @since 2.1 */ public this(Device device, FontData[] fds) { super(device); if (fds is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); if (fds.length is 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT); for (int i=0; i<fds.length; i++) { if (fds[i] is null) DWT.error(DWT.ERROR_INVALID_ARGUMENT); } FontData fd = fds[0]; init_(fd.getName(), fd.getHeightF(), fd.getStyle(), fd.str); init_(); } /** * 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 DWTError <ul> * <li>ERROR_NO_HANDLES - if a font could not be created from the given arguments</li> * </ul> */ public this(Device device, String name, int height, int style) { super(device); init_(name, height, style, null); init_(); } /*public*/ this(Device device, String name, float height, int style) { super(device); init_(name, height, style, null); init_(); } void destroy() { OS.pango_font_description_free(handle); handle = 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 override int opEquals(Object object) { if (object is this) return true; if ( auto font = cast(Font)object ){ return handle is font.handle; } return false; } /** * 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 DWTException <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ public FontData[] getFontData() { if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); auto family = OS.pango_font_description_get_family(handle); String name = fromStringz( family ); float height = cast(float)OS.pango_font_description_get_size(handle) / OS.PANGO_SCALE; int pangoStyle = OS.pango_font_description_get_style(handle); int pangoWeight = OS.pango_font_description_get_weight(handle); int style = DWT.NORMAL; if (pangoStyle is OS.PANGO_STYLE_ITALIC) style |= DWT.ITALIC; if (pangoStyle is OS.PANGO_STYLE_OBLIQUE) style |= DWT.ROMAN; if (pangoWeight >= OS.PANGO_WEIGHT_BOLD) style |= DWT.BOLD; auto fontString = OS.pango_font_description_to_string (handle); auto buffer = fromStringz( fontString ).dup; FontData data = new FontData( buffer , height, style); OS.g_free (fontString); data.str = buffer; return [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 DWT. 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 * * @private */ public static Font gtk_new(Device device, PangoFontDescription* handle) { Font font = new Font(device); font.handle = handle; return font; } /** * 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 override hash_t toHash() { return cast(hash_t)/*64*/handle; } void init_(String name, float height, int style, char[] fontString) { if (name is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); if (height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT); if (fontString !is null) { handle = OS.pango_font_description_from_string (toStringz(fontString)); if (handle is null) DWT.error(DWT.ERROR_NO_HANDLES); } else { handle = OS.pango_font_description_new(); if (handle is null) DWT.error(DWT.ERROR_NO_HANDLES); //byte[] buffer = Converter.wcsToMbcs(null, name, true); OS.pango_font_description_set_family(handle, toStringz(name) ); if (height > 0) { OS.pango_font_description_set_size(handle, cast(int)(0.5f + height * OS.PANGO_SCALE)); } OS.pango_font_description_set_stretch(handle, OS.PANGO_STRETCH_NORMAL); int pangoStyle = OS.PANGO_STYLE_NORMAL; int pangoWeight = OS.PANGO_WEIGHT_NORMAL; if ((style & DWT.ITALIC) !is 0) pangoStyle = OS.PANGO_STYLE_ITALIC; if ((style & DWT.ROMAN) !is 0) pangoStyle = OS.PANGO_STYLE_OBLIQUE; if ((style & DWT.BOLD) !is 0) pangoWeight = OS.PANGO_WEIGHT_BOLD; OS.pango_font_description_set_style(handle, pangoStyle); OS.pango_font_description_set_weight(handle, pangoWeight); } } /** * 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 override bool isDisposed() { return handle is 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 Format( "Font {{{}}", handle ); } }