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comparison dwt/custom/StyledTextDropTargetEffect.d @ 213:36f5cb12e1a2

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Update to SWT 3.4M7
author Frank Benoit <benoit@tionex.de>
date Sat, 17 May 2008 17:34:28 +0200
parents a5afe31f5cdd
children fd9c62a2998e
comparison
equal deleted inserted replaced
212:ab60f3309436 213:36f5cb12e1a2
16 import dwt.DWT; 16 import dwt.DWT;
17 import dwt.dnd.DND; 17 import dwt.dnd.DND;
18 import dwt.dnd.DropTargetAdapter; 18 import dwt.dnd.DropTargetAdapter;
19 import dwt.dnd.DropTargetEffect; 19 import dwt.dnd.DropTargetEffect;
20 import dwt.dnd.DropTargetEvent; 20 import dwt.dnd.DropTargetEvent;
21 import dwt.graphics.FontMetrics;
22 import dwt.graphics.GC;
21 import dwt.graphics.Point; 23 import dwt.graphics.Point;
22 import dwt.graphics.Rectangle; 24 import dwt.graphics.Rectangle;
23 import dwt.widgets.Event; 25 import dwt.widgets.Event;
24 import dwt.widgets.Listener; 26 import dwt.widgets.Listener;
25 import dwt.custom.StyledText; 27 import dwt.custom.StyledText;
29 import Math = tango.math.Math; 31 import Math = tango.math.Math;
30 import dwt.dwthelper.utils; 32 import dwt.dwthelper.utils;
31 33
32 /** 34 /**
33 * This adapter class provides a default drag under effect (eg. select and scroll) 35 * This adapter class provides a default drag under effect (eg. select and scroll)
34 * when a drag occurs over a <code>Table</code>. 36 * when a drag occurs over a <code>StyledText</code>.
35 * 37 *
36 * <p>Classes that wish to provide their own drag under effect for a <code>StyledText</code> 38 * <p>Classes that wish to provide their own drag under effect for a <code>StyledText</code>
37 * can extend this class, override the <code>StyledTextDropTargetEffect.dragOver</code> 39 * can extend this class, override the <code>StyledTextDropTargetEffect.dragOver</code>
38 * method and override any other applicable methods in <code>StyledTextDropTargetEffect</code> to 40 * method and override any other applicable methods in <code>StyledTextDropTargetEffect</code> to
39 * display their own drag under effect.</p> 41 * display their own drag under effect.</p>
170 if (scrollX !is -1 && scrollY !is -1 && scrollBeginTime !is 0 && 172 if (scrollX !is -1 && scrollY !is -1 && scrollBeginTime !is 0 &&
171 (pt.x >= scrollX && pt.x <= (scrollX + SCROLL_TOLERANCE) || 173 (pt.x >= scrollX && pt.x <= (scrollX + SCROLL_TOLERANCE) ||
172 pt.y >= scrollY && pt.y <= (scrollY + SCROLL_TOLERANCE))) { 174 pt.y >= scrollY && pt.y <= (scrollY + SCROLL_TOLERANCE))) {
173 if (System.currentTimeMillis() >= scrollBeginTime) { 175 if (System.currentTimeMillis() >= scrollBeginTime) {
174 Rectangle area = text.getClientArea(); 176 Rectangle area = text.getClientArea();
175 Rectangle bounds = text.getTextBounds(0, 0); 177 GC gc = new GC(text);
176 int charWidth = bounds.width; 178 FontMetrics fm = gc.getFontMetrics();
179 gc.dispose();
180 int charWidth = fm.getAverageCharWidth();
177 int scrollAmount = 10*charWidth; 181 int scrollAmount = 10*charWidth;
178 if (pt.x < area.x + 3*charWidth) { 182 if (pt.x < area.x + 3*charWidth) {
179 int leftPixel = text.getHorizontalPixel(); 183 int leftPixel = text.getHorizontalPixel();
180 text.setHorizontalPixel(leftPixel - scrollAmount); 184 text.setHorizontalPixel(leftPixel - scrollAmount);
181 if (text.getHorizontalPixel() !is leftPixel) {
182 text.redraw();
183 }
184 } 185 }
185 if (pt.x > area.width - 3*charWidth) { 186 if (pt.x > area.width - 3*charWidth) {
186 int leftPixel = text.getHorizontalPixel(); 187 int leftPixel = text.getHorizontalPixel();
187 text.setHorizontalPixel(leftPixel + scrollAmount); 188 text.setHorizontalPixel(leftPixel + scrollAmount);
188 if (text.getHorizontalPixel() !is leftPixel) { 189 }
189 text.redraw(); 190 int lineHeight = text.getLineHeight();
190 }
191 }
192 int lineHeight = bounds.height;
193 if (pt.y < area.y + lineHeight) { 191 if (pt.y < area.y + lineHeight) {
194 int topPixel = text.getTopPixel(); 192 int topPixel = text.getTopPixel();
195 text.setTopPixel(topPixel - lineHeight); 193 text.setTopPixel(topPixel - lineHeight);
196 if (text.getTopPixel() !is topPixel) {
197 text.redraw();
198 }
199 } 194 }
200 if (pt.y > area.height - lineHeight) { 195 if (pt.y > area.height - lineHeight) {
201 int topPixel = text.getTopPixel(); 196 int topPixel = text.getTopPixel();
202 text.setTopPixel(topPixel + lineHeight); 197 text.setTopPixel(topPixel + lineHeight);
203 if (text.getTopPixel() !is topPixel) {
204 text.redraw();
205 }
206 } 198 }
207 scrollBeginTime = 0; 199 scrollBeginTime = 0;
208 scrollX = scrollY = -1; 200 scrollX = scrollY = -1;
209 } 201 }
210 } else { 202 } else {
214 } 206 }
215 } 207 }
216 } 208 }
217 209
218 if ((effect & DND.FEEDBACK_SELECT) !is 0) { 210 if ((effect & DND.FEEDBACK_SELECT) !is 0) {
219 StyledTextContent content = text.getContent(); 211 int[] trailing = new int [1];
220 int newOffset = -1; 212 int newOffset = text.getOffsetAtPoint(pt.x, pt.y, trailing, false);
221 try { 213 newOffset += trailing [0];
222 newOffset = text.getOffsetAtLocation(pt); 214 if (newOffset !is currentOffset) {
223 } catch ( tango.core.Exception.IllegalArgumentException ex1) {
224 int maxOffset = content.getCharCount();
225 Point maxLocation = text.getLocationAtOffset(maxOffset);
226 if (pt.y >= maxLocation.y) {
227 try {
228 newOffset = text.getOffsetAtLocation(new Point(pt.x, maxLocation.y));
229 } catch (tango.core.Exception.IllegalArgumentException ex2) {
230 newOffset = maxOffset;
231 }
232 } else {
233 try {
234 int startOffset = text.getOffsetAtLocation(new Point(0, pt.y));
235 int endOffset = maxOffset;
236 int line = content.getLineAtOffset(startOffset);
237 int lineCount = content.getLineCount();
238 if (line + 1 < lineCount) {
239 endOffset = content.getOffsetAtLine(line + 1) - 1;
240 }
241 int lineHeight = text.getLineHeight(startOffset);
242 for (int i = endOffset; i >= startOffset; i--) {
243 Point p = text.getLocationAtOffset(i);
244 if (p.x < pt.x && p.y < pt.y && p.y + lineHeight > pt.y) {
245 newOffset = i;
246 break;
247 }
248 }
249 } catch (tango.core.Exception.IllegalArgumentException ex2) {
250 newOffset = -1;
251 }
252 }
253 }
254 if (newOffset !is -1 && newOffset !is currentOffset) {
255 // check if offset is line delimiter
256 // see StyledText.isLineDelimiter()
257 int line = content.getLineAtOffset(newOffset);
258 int lineOffset = content.getOffsetAtLine(line);
259 int offsetInLine = newOffset - lineOffset;
260 // offsetInLine will be greater than line length if the line
261 // delimiter is longer than one character and the offset is set
262 // in between parts of the line delimiter.
263 if (offsetInLine > content.getLine(line).length) {
264 newOffset = Math.max(0, newOffset - 1);
265 }
266 refreshCaret(text, currentOffset, newOffset); 215 refreshCaret(text, currentOffset, newOffset);
267 currentOffset = newOffset; 216 currentOffset = newOffset;
268 } 217 }
269 } 218 }
270 } 219 }