author | hgs |
Fri, 15 Oct 2010 12:29:39 +0300 | |
changeset 80 | d6dafc5d983f |
parent 21 | 2a9601315dfc |
permissions | -rw-r--r-- |
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/******************************************************************************* |
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. This program and the accompanying materials |
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* are made available under the terms of the Eclipse Public License v1.0 |
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* which accompanies this distribution, and is available at |
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* http://www.eclipse.org/legal/epl-v10.html |
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* |
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* Contributors: |
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* Nokia Corporation - initial implementation |
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*******************************************************************************/ |
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Revision: v2.1.22
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package org.eclipse.swt.internal.qt.graphics; |
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|
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/** |
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* This is a helper class for getting font related information |
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* ouside GraphicsContext bind-release cycle, i.e. these utilities must be used for getting |
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Revision: v2.1.22
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* font metrics when GraphicsContext does not have a target and it's methods cannot be used. |
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* These utilities do not have any dependency to GraphicsContext or it's state. |
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*/ |
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public final class FontUtils { |
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|
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/** |
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* handle of native QFont |
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*/ |
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private int handle; |
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|
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/** |
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* Constructs FontUtils with specified font handle |
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* |
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* @param fontHandle Handle of native QFont |
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* @throws IllegalArgumentException if given font handle is 0 |
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*/ |
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public FontUtils(int fontHandle) { |
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checkState(); |
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setFont(fontHandle); |
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} |
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|
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/** |
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* Returns the ascent of the font. |
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* The ascent of a font is the distance from baseline to the highest position characters extent to. |
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* |
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* @return The ascent for this font |
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*/ |
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public int getAscent() { |
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checkState(); |
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return OS.fontUtils_getAscent(handle); |
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} |
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|
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/** |
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* Returns the bounding rectangle that is covered by given text if drawn at origo, |
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* i.e. coordinates (0,0). The vertical base point is based on the text baseline, i.e. |
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* y-coordinate is always negative as text extends ascent number of pixel up from baseline. |
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* Bounding rectangle height is based on font height not the actual height that the text would occupy. |
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* |
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* Note that the bounding rectangle might extent to left of (0,0), e.g. for italized fonts. |
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* |
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* Values are stored in boundingBox array as follows: |
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* <ul> |
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* <li>rect[GraphicsContect.RECT_X] - the x coordinate of rect</li> |
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* <li>rect[GraphicsContect.RECT_Y] - the y coordinate of rect |
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* <li>rect[GraphicsContect.RECT_WIDTH] - the width of rect |
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* <li>rect[GraphicsContect.RECT_HEIGHT] - the height of rect |
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* </ul> |
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* |
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* @param boundingBox The array to where populate rect, size must not be < 4 |
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* @param str The text to measure |
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* @return bounding rectangle coordinates x, y, width and height |
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* |
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* @throws IllegalArgumentException if size of <code>rect</code> is < 4 |
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* @throws NullPointerException if <code>rect</code> or <code>str</code> is null |
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* |
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*/ |
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public void getBoundingRect(int[] boundingBox, String str) { |
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checkState(); |
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if(boundingBox == null || str == null) { |
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throw new NullPointerException("boundingBox or str is null"); |
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} |
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if(boundingBox.length < 4) { |
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throw new IllegalArgumentException("boundingBox size is < 4"); |
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} |
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|
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if(str.length() == 0) { |
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for(int i=0; i<4; i++) |
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{ |
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boundingBox[i]=0; |
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} |
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return; |
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} |
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OS.fontUtils_getBoundingRect(handle, boundingBox, str); |
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} |
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|
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/** |
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* Returns the descent of the font. |
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* The descent is of a font is the distance from baseline to the lowest position characters extent to. |
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* |
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* @return The ascent for this font |
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*/ |
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public int getDescent() { |
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checkState(); |
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return OS.fontUtils_getDescent(handle); |
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} |
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101 |
|
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102 |
/** |
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* Sets new font to this instance. |
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* All subsequent measurements are based on the font set with this method. |
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105 |
* |
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* @param fontHandle Handle of native QFont |
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* @throws IllegalArgumentException if given font handle is 0 |
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108 |
*/ |
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public void setFont(int fontHandle) { |
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checkState(); |
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if(fontHandle != 0) { |
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handle = fontHandle; |
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} else { |
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throw new IllegalArgumentException("fontHandle is 0"); |
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115 |
} |
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} |
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117 |
|
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118 |
/** |
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* Gets the advance width of the specified string when using the currently set font. |
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* The width specifies the distance where next character should ne drawn, note that |
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* the last character might partially be drawn beyond the right side of the returned width. |
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122 |
* |
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* @param str The characters to measure |
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* @return The total advance width or 0 if size of str is 0 |
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* @throws NullPointerException if <code>str</code> is null |
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126 |
*/ |
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public int stringWidth(String str) { |
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checkState(); |
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if(str == null) { |
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throw new NullPointerException("str is null"); |
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131 |
} |
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if(str.length() == 0) { |
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return 0; |
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} |
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return OS.fontUtils_getStringWidth(handle, str); |
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} |
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137 |
|
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138 |
|
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139 |
/** |
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* private method for checking the state of this instance. |
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141 |
*/ |
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private void checkState() { |
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Utils.validateUiThread(); |
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} |
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145 |
|
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146 |
} |