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1: /* ComponentView.java -- 2: Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: package javax.swing.text; 39: 40: import java.awt.Component; 41: import java.awt.Container; 42: import java.awt.Graphics; 43: import java.awt.Rectangle; 44: import java.awt.Shape; 45: 46: import javax.swing.SwingConstants; 47: import javax.swing.SwingUtilities; 48: 49: /** 50: * A {@link View} implementation that is able to render arbitrary 51: * {@link Component}s. This uses the attribute 52: * {@link StyleConstants#ComponentAttribute} to determine the 53: * <code>Component</code> that should be rendered. This <code>Component</code> 54: * becomes a direct child of the <code>JTextComponent</code> that contains 55: * this <code>ComponentView</code>, so this view must not be shared between 56: * multiple <code>JTextComponent</code>s. 57: * 58: * @author Roman Kennke (kennke@aicas.com) 59: * @author original author unknown 60: */ 61: public class ComponentView extends View 62: { 63: 64: /** 65: * The component that is displayed by this view. 66: */ 67: private Component comp; 68: 69: /** 70: * Creates a new instance of <code>ComponentView</code> for the specified 71: * <code>Element</code>. 72: * 73: * @param elem the element that this <code>View</code> is rendering 74: */ 75: public ComponentView(Element elem) 76: { 77: super(elem); 78: } 79: 80: /** 81: * Creates the <code>Component</code> that this <code>View</code> is 82: * rendering. The <code>Component</code> is determined using 83: * the {@link StyleConstants#ComponentAttribute} of the associated 84: * <code>Element</code>. 85: * 86: * @return the component that is rendered 87: */ 88: protected Component createComponent() 89: { 90: return StyleConstants.getComponent(getElement().getAttributes()); 91: } 92: 93: /** 94: * Returns the alignment of this <code>View</code> along the specified axis. 95: * 96: * @param axis either {@link View#X_AXIS} or {@link View#Y_AXIS} 97: * 98: * @return the alignment of this <code>View</code> along the specified axis 99: */ 100: public float getAlignment(int axis) 101: { 102: float align; 103: if (axis == X_AXIS) 104: align = getComponent().getAlignmentX(); 105: else if (axis == Y_AXIS) 106: align = getComponent().getAlignmentY(); 107: else 108: throw new IllegalArgumentException(); 109: return align; 110: } 111: 112: /** 113: * Returns the <code>Component</code> that is rendered by this 114: * <code>ComponentView</code>. 115: * 116: * @return the <code>Component</code> that is rendered by this 117: * <code>ComponentView</code> 118: */ 119: public final Component getComponent() 120: { 121: if (comp == null) 122: comp = createComponent(); 123: return comp; 124: } 125: 126: /** 127: * Returns the maximum span of this <code>View</code> along the specified 128: * axis. 129: * 130: * This will return {@link Component#getMaximumSize()} for the specified 131: * axis. 132: * 133: * @return the maximum span of this <code>View</code> along the specified 134: * axis 135: */ 136: public float getMaximumSpan(int axis) 137: { 138: float span; 139: if (axis == X_AXIS) 140: span = getComponent().getMaximumSize().width; 141: else if (axis == Y_AXIS) 142: span = getComponent().getMaximumSize().height; 143: else 144: throw new IllegalArgumentException(); 145: return span; 146: } 147: 148: public float getMinimumSpan(int axis) 149: { 150: float span; 151: if (axis == X_AXIS) 152: span = getComponent().getMinimumSize().width; 153: else if (axis == Y_AXIS) 154: span = getComponent().getMinimumSize().height; 155: else 156: throw new IllegalArgumentException(); 157: return span; 158: } 159: 160: public float getPreferredSpan(int axis) 161: { 162: float span; 163: if (axis == X_AXIS) 164: span = getComponent().getPreferredSize().width; 165: else if (axis == Y_AXIS) 166: span = getComponent().getPreferredSize().height; 167: else 168: throw new IllegalArgumentException(); 169: return span; 170: } 171: 172: public Shape modelToView(int pos, Shape a, Position.Bias b) 173: throws BadLocationException 174: { 175: Element el = getElement(); 176: if (pos < el.getStartOffset() || pos >= el.getEndOffset()) 177: throw new BadLocationException("Illegal offset for this view", pos); 178: Rectangle r = a.getBounds(); 179: Component c = getComponent(); 180: return new Rectangle(r.x, r.y, c.getWidth(), c.getHeight()); 181: } 182: 183: /** 184: * The real painting behavour is performed by normal component painting, 185: * triggered by the text component that hosts this view. This method does 186: * not paint by itself. However, it sets the size of the component according 187: * to the allocation that is passed here. 188: * 189: * @param g the graphics context 190: * @param a the allocation of the child 191: */ 192: public void paint(Graphics g, Shape a) 193: { 194: Rectangle r = a.getBounds(); 195: getComponent().setBounds(r.x, r.y, r.width, r.height); 196: } 197: 198: /** 199: * This sets up the component when the view is added to its parent, or 200: * cleans up the view when it is removed from its parent. 201: * 202: * When this view is added to a parent view, the component of this view 203: * is added to the container that hosts this view. When <code>p</code> is 204: * <code>null</code>, then the view is removed from it's parent and we have 205: * to also remove the component from it's parent container. 206: * 207: * @param p the parent view or <code>null</code> if this view is removed 208: * from it's parent 209: */ 210: public void setParent(final View p) 211: { 212: if (SwingUtilities.isEventDispatchThread()) 213: setParentImpl(p); 214: else 215: SwingUtilities.invokeLater 216: (new Runnable() 217: { 218: public void run() 219: { 220: setParentImpl(p); 221: } 222: }); 223: } 224: 225: /** 226: * The implementation of {@link #setParent}. This is package private to 227: * avoid a synthetic accessor method. 228: * 229: * @param p the parent view to set 230: */ 231: void setParentImpl(View p) 232: { 233: if (p != null) 234: { 235: Component c = getComponent(); 236: p.getContainer().add(c); 237: } 238: else 239: { 240: Component c = getComponent(); 241: Container parent = c.getParent(); 242: parent.remove(c); 243: comp = null; 244: } 245: } 246: 247: /** 248: * Maps coordinates from the <code>View</code>'s space into a position 249: * in the document model. 250: * 251: * @param x the x coordinate in the view space 252: * @param y the y coordinate in the view space 253: * @param a the allocation of this <code>View</code> 254: * @param b the bias to use 255: * 256: * @return the position in the document that corresponds to the screen 257: * coordinates <code>x, y</code> 258: */ 259: public int viewToModel(float x, float y, Shape a, Position.Bias[] b) 260: { 261: // The element should only have one character position and it is clear 262: // that this position is the position that best matches the given screen 263: // coordinates, simply because this view has only this one position. 264: Element el = getElement(); 265: return el.getStartOffset(); 266: } 267: }
GNU Classpath (0.20) |