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1
11 package org.eclipse.swt.dnd;
12
13 import org.eclipse.swt.*;
14 import org.eclipse.swt.graphics.*;
15 import org.eclipse.swt.internal.win32.*;
16 import org.eclipse.swt.widgets.*;
17
18 class TreeDragAndDropEffect extends DragAndDropEffect {
19 Tree tree;
20 int dropIndex;
21 int scrollIndex;
22 long scrollBeginTime;
23 int expandIndex;
24 long expandBeginTime;
25 TreeItem insertItem;
26 boolean insertBefore;
27
28 static final int SCROLL_HYSTERESIS = 200; static final int EXPAND_HYSTERESIS = 300;
31
32 TreeDragAndDropEffect(Tree tree) {
33 this.tree = tree;
34 }
35
36 int checkEffect(int effect) {
37 if ((effect & DND.FEEDBACK_SELECT) != 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
39 if ((effect & DND.FEEDBACK_INSERT_BEFORE) != 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
40 return effect;
41 }
42
43 Widget getItem(int x, int y) {
44 Point coordinates = new Point(x, y);
45 coordinates = tree.toControl(coordinates);
46 TreeItem item = tree.getItem(coordinates);
47 if (item == null) {
48 Rectangle area = tree.getClientArea();
49 if (area.contains(coordinates)) {
50 for (int x1 = area.x; x1 < area.x + area.width; x1++) {
52 Point pt = new Point(x1, coordinates.y);
53 item = tree.getItem(pt);
54 if (item != null) {
55 break;
56 }
57 }
58 }
59 }
60 return item;
61 }
62
63 ImageData getDragSourceImage(int x, int y) {
64 TreeItem[] selection = tree.getSelection();
65 if (selection.length == 0) return null;
66 int treeImageList = OS.SendMessage (tree.handle, OS.TVM_GETIMAGELIST, OS.TVSIL_NORMAL, 0);
67 if (treeImageList != 0) {
68 int count = Math.min(selection.length, 10);
69 Rectangle bounds = selection[0].getBounds(0);
70 for (int i = 1; i < count; i++) {
71 bounds = bounds.union(selection[i].getBounds(0));
72 }
73 int hDC = OS.GetDC(0);
74 int hDC1 = OS.CreateCompatibleDC(hDC);
75 int bitmap = OS.CreateCompatibleBitmap(hDC, bounds.width, bounds.height);
76 int hOldBitmap = OS.SelectObject(hDC1, bitmap);
77 RECT rect = new RECT();
78 rect.right = bounds.width;
79 rect.bottom = bounds.height;
80 int hBrush = OS.GetStockObject(OS.WHITE_BRUSH);
81 OS.FillRect(hDC1, rect, hBrush);
82 for (int i = 0; i < count; i++) {
83 TreeItem selected = selection[i];
84 Rectangle cell = selected.getBounds(0);
85 int imageList = OS.SendMessage(tree.handle, OS.TVM_CREATEDRAGIMAGE, 0, selected.handle);
86 OS.ImageList_Draw(imageList, 0, hDC1, cell.x - bounds.x, cell.y - bounds.y, OS.ILD_SELECTED);
87 OS.ImageList_Destroy(imageList);
88 }
89 OS.SelectObject(hDC1, hOldBitmap);
90 OS.DeleteDC (hDC1);
91 OS.ReleaseDC (0, hDC);
92 Display display = tree.getDisplay();
93 Image image = Image.win32_new(display, SWT.BITMAP, bitmap);
94 ImageData imageData = image.getImageData();
95 image.dispose();
96 return imageData;
97 }
98 return null;
99 }
100
101 void showDropTargetEffect(int effect, int x, int y) {
102 effect = checkEffect(effect);
103 int handle = tree.handle;
104 Point coordinates = new Point(x, y);
105 coordinates = tree.toControl(coordinates);
106 TVHITTESTINFO lpht = new TVHITTESTINFO ();
107 lpht.x = coordinates.x;
108 lpht.y = coordinates.y;
109 OS.SendMessage (handle, OS.TVM_HITTEST, 0, lpht);
110 int hItem = lpht.hItem;
111 if ((effect & DND.FEEDBACK_SCROLL) == 0) {
112 scrollBeginTime = 0;
113 scrollIndex = -1;
114 } else {
115 if (hItem != -1 && scrollIndex == hItem && scrollBeginTime != 0) {
116 if (System.currentTimeMillis() >= scrollBeginTime) {
117 int topItem = OS.SendMessage(handle, OS.TVM_GETNEXTITEM, OS.TVGN_FIRSTVISIBLE, 0);
118 int nextItem = OS.SendMessage(handle, OS.TVM_GETNEXTITEM, hItem == topItem ? OS.TVGN_PREVIOUSVISIBLE : OS.TVGN_NEXTVISIBLE, hItem);
119 boolean scroll = true;
120 if (hItem == topItem) {
121 scroll = nextItem != 0;
122 } else {
123 RECT itemRect = new RECT ();
124 itemRect.left = nextItem;
125 if (OS.SendMessage (handle, OS.TVM_GETITEMRECT, 1, itemRect) != 0) {
126 RECT rect = new RECT ();
127 OS.GetClientRect (handle, rect);
128 POINT pt = new POINT ();
129 pt.x = itemRect.left;
130 pt.y = itemRect.top;
131 if (OS.PtInRect (rect, pt)) {
132 pt.y = itemRect.bottom;
133 if (OS.PtInRect (rect, pt)) scroll = false;
134 }
135 }
136 }
137 if (scroll) {
138 OS.SendMessage (handle, OS.TVM_ENSUREVISIBLE, 0, nextItem);
139 tree.redraw();
140 }
141 scrollBeginTime = 0;
142 scrollIndex = -1;
143 }
144 } else {
145 scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
146 scrollIndex = hItem;
147 }
148 }
149 if ((effect & DND.FEEDBACK_EXPAND) == 0) {
150 expandBeginTime = 0;
151 expandIndex = -1;
152 } else {
153 if (hItem != -1 && expandIndex == hItem && expandBeginTime != 0) {
154 if (System.currentTimeMillis() >= expandBeginTime) {
155 if (OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CHILD, hItem) != 0) {
156 TVITEM tvItem = new TVITEM ();
157 tvItem.hItem = hItem;
158 tvItem.mask = OS.TVIF_HANDLE | OS.TVIF_STATE;
159 OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
160 if ((tvItem.state & OS.TVIS_EXPANDED) == 0) {
161 OS.SendMessage (handle, OS.TVM_EXPAND, OS.TVE_EXPAND, hItem);
162 tree.redraw();
163 }
164 }
165 expandBeginTime = 0;
166 expandIndex = -1;
167 }
168 } else {
169 expandBeginTime = System.currentTimeMillis() + EXPAND_HYSTERESIS;
170 expandIndex = hItem;
171 }
172 }
173 if (dropIndex != -1 && (dropIndex != hItem || (effect & DND.FEEDBACK_SELECT) == 0)) {
174 TVITEM tvItem = new TVITEM ();
175 tvItem.hItem = dropIndex;
176 tvItem.mask = OS.TVIF_STATE;
177 tvItem.stateMask = OS.TVIS_DROPHILITED;
178 tvItem.state = 0;
179 OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
180 dropIndex = -1;
181 }
182 if (hItem != -1 && hItem != dropIndex && (effect & DND.FEEDBACK_SELECT) != 0) {
183 TVITEM tvItem = new TVITEM ();
184 tvItem.hItem = hItem;
185 tvItem.mask = OS.TVIF_STATE;
186 tvItem.stateMask = OS.TVIS_DROPHILITED;
187 tvItem.state = OS.TVIS_DROPHILITED;
188 OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
189 dropIndex = hItem;
190 }
191 if ((effect & DND.FEEDBACK_INSERT_BEFORE) != 0 || (effect & DND.FEEDBACK_INSERT_AFTER) != 0) {
192 boolean before = (effect & DND.FEEDBACK_INSERT_BEFORE) != 0;
193
202 TreeItem item = (TreeItem)tree.getDisplay().findWidget(tree.handle, hItem);
203 if (item != null) {
204 if (item != insertItem || before != insertBefore) {
205 tree.setInsertMark(item, before);
206 }
207 insertItem = item;
208 insertBefore = before;
209 } else {
210 if (insertItem != null) {
211 tree.setInsertMark(null, false);
212 }
213 insertItem = null;
214 }
215 } else {
216 if (insertItem != null) {
217 tree.setInsertMark(null, false);
218 }
219 insertItem = null;
220 }
221 return;
222 }
223 }
224 |
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