/** Compute the minimum size. */
private Point getTotalSize(Image image, String text) {
Point size = new Point(0, 0);
if (image != null) {
Rectangle r = image.getBounds();
size.x += r.width;
size.y += r.height;
}
GC gc = new GC(this);
if (text != null && text.length() > 0) {
Point e = gc.textExtent(text, DRAW_FLAGS);
size.x += e.x;
size.y = Math.max(size.y, e.y);
if (image != null) size.x += GAP;
} else {
size.y = Math.max(size.y, gc.getFontMetrics().getHeight());
}
gc.dispose();
return size;
}
public static void main(String[] args) {
final Display display = new Display();
final Image image = new Image(display, 16, 16);
GC gc = new GC(image);
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
gc.fillRectangle(image.getBounds());
gc.dispose();
final Shell shell = new Shell(display);
shell.setText("Lazy Table");
shell.setLayout(new FillLayout());
final Table table = new Table(shell, SWT.BORDER | SWT.MULTI);
table.setSize(200, 200);
Thread thread =
new Thread() {
@Override
public void run() {
for (int i = 0; i < 20000; i++) {
if (table.isDisposed()) return;
final int[] index = new int[] {i};
display.syncExec(
() -> {
if (table.isDisposed()) return;
TableItem item = new TableItem(table, SWT.NONE);
item.setText("Table Item " + index[0]);
item.setImage(image);
});
}
}
};
thread.start();
shell.setSize(200, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
image.dispose();
display.dispose();
}
void paint(Event event) {
if (row == null) return;
int columnIndex = column == null ? 0 : table.indexOf(column);
GC gc = event.gc;
gc.setBackground(getBackground());
gc.setForeground(getForeground());
gc.fillRectangle(event.x, event.y, event.width, event.height);
int x = 0;
Point size = getSize();
Image image = row.getImage(columnIndex);
if (image != null) {
Rectangle imageSize = image.getBounds();
int imageY = (size.y - imageSize.height) / 2;
gc.drawImage(image, x, imageY);
x += imageSize.width;
}
String text = row.getText(columnIndex);
if (text.length() > 0) {
Rectangle bounds = row.getBounds(columnIndex);
Point extent = gc.stringExtent(text);
// Temporary code - need a better way to determine table trim
String platform = SWT.getPlatform();
if ("win32".equals(platform)) { // $NON-NLS-1$
if (table.getColumnCount() == 0 || columnIndex == 0) {
x += 2;
} else {
int alignmnent = column.getAlignment();
switch (alignmnent) {
case SWT.LEFT:
x += 6;
break;
case SWT.RIGHT:
x = bounds.width - extent.x - 6;
break;
case SWT.CENTER:
x += (bounds.width - x - extent.x) / 2;
break;
}
}
} else {
if (table.getColumnCount() == 0) {
x += 5;
} else {
int alignmnent = column.getAlignment();
switch (alignmnent) {
case SWT.LEFT:
x += 5;
break;
case SWT.RIGHT:
x = bounds.width - extent.x - 2;
break;
case SWT.CENTER:
x += (bounds.width - x - extent.x) / 2 + 2;
break;
}
}
}
int textY = (size.y - extent.y) / 2;
gc.drawString(text, x, textY);
}
if (isFocusControl()) {
Display display = getDisplay();
gc.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
gc.drawFocus(0, 0, size.x, size.y);
}
}
private void drag(Event dragEvent) {
DNDEvent event = new DNDEvent();
event.widget = this;
event.x = dragEvent.x;
event.y = dragEvent.y;
event.time = OS.GetMessageTime();
event.doit = true;
notifyListeners(DND.DragStart, event);
if (!event.doit || transferAgents == null || transferAgents.length == 0) return;
int[] pdwEffect = new int[1];
int operations = opToOs(getStyle());
Display display = control.getDisplay();
String key = "org.eclipse.swt.internal.win32.runMessagesInIdle"; // $NON-NLS-1$
Object oldValue = display.getData(key);
display.setData(key, Boolean.TRUE);
ImageList imagelist = null;
Image image = event.image;
hwndDrag = 0;
topControl = null;
if (image != null) {
imagelist = new ImageList(SWT.NONE);
imagelist.add(image);
topControl = control.getShell();
/*
* Bug in Windows. The image is inverted if the shell is RIGHT_TO_LEFT.
* The fix is to create a transparent window that covers the shell client
* area and use it during the drag to prevent the image from being inverted.
* On XP if the shell is RTL, the image is not displayed.
*/
int offsetX = event.offsetX;
hwndDrag = topControl.handle;
if ((topControl.getStyle() & SWT.RIGHT_TO_LEFT) != 0) {
offsetX = image.getBounds().width - offsetX;
RECT rect = new RECT();
OS.GetClientRect(topControl.handle, rect);
hwndDrag =
OS.CreateWindowEx(
OS.WS_EX_TRANSPARENT | OS.WS_EX_NOINHERITLAYOUT,
WindowClass,
null,
OS.WS_CHILD | OS.WS_CLIPSIBLINGS,
0,
0,
rect.right - rect.left,
rect.bottom - rect.top,
topControl.handle,
0,
OS.GetModuleHandle(null),
null);
OS.ShowWindow(hwndDrag, OS.SW_SHOW);
}
OS.ImageList_BeginDrag(imagelist.getHandle(), 0, offsetX, event.offsetY);
/*
* Feature in Windows. When ImageList_DragEnter() is called,
* it takes a snapshot of the screen If a drag is started
* when another window is in front, then the snapshot will
* contain part of the other window, causing pixel corruption.
* The fix is to force all paints to be delivered before
* calling ImageList_DragEnter().
*/
if (OS.IsWinCE) {
OS.UpdateWindow(topControl.handle);
} else {
int flags = OS.RDW_UPDATENOW | OS.RDW_ALLCHILDREN;
OS.RedrawWindow(topControl.handle, null, 0, flags);
}
POINT pt = new POINT();
pt.x = dragEvent.x;
pt.y = dragEvent.y;
OS.MapWindowPoints(control.handle, 0, pt, 1);
RECT rect = new RECT();
OS.GetWindowRect(hwndDrag, rect);
OS.ImageList_DragEnter(hwndDrag, pt.x - rect.left, pt.y - rect.top);
}
int result = COM.DRAGDROP_S_CANCEL;
try {
result =
COM.DoDragDrop(iDataObject.getAddress(), iDropSource.getAddress(), operations, pdwEffect);
} finally {
// ensure that we don't leave transparent window around
if (hwndDrag != 0) {
OS.ImageList_DragLeave(hwndDrag);
OS.ImageList_EndDrag();
imagelist.dispose();
if (hwndDrag != topControl.handle) OS.DestroyWindow(hwndDrag);
hwndDrag = 0;
topControl = null;
}
display.setData(key, oldValue);
}
int operation = osToOp(pdwEffect[0]);
if (dataEffect == DND.DROP_MOVE) {
operation =
(operation == DND.DROP_NONE || operation == DND.DROP_COPY)
? DND.DROP_TARGET_MOVE
: DND.DROP_MOVE;
} else {
if (dataEffect != DND.DROP_NONE) {
operation = dataEffect;
}
}
event = new DNDEvent();
event.widget = this;
event.time = OS.GetMessageTime();
event.doit = (result == COM.DRAGDROP_S_DROP);
event.detail = operation;
notifyListeners(DND.DragEnd, event);
dataEffect = DND.DROP_NONE;
}
void onPaint(PaintEvent event) {
Rectangle rect = getClientArea();
if (rect.width == 0 || rect.height == 0) return;
boolean shortenText = false;
String t = text;
Image img = image;
int availableWidth = Math.max(0, rect.width - (leftMargin + rightMargin));
Point extent = getTotalSize(img, t);
if (extent.x > availableWidth) {
img = null;
extent = getTotalSize(img, t);
if (extent.x > availableWidth) {
shortenText = true;
}
}
GC gc = event.gc;
String[] lines = text == null ? null : splitString(text);
// shorten the text
if (shortenText) {
extent.x = 0;
for (int i = 0; i < lines.length; i++) {
Point e = gc.textExtent(lines[i], DRAW_FLAGS);
if (e.x > availableWidth) {
lines[i] = shortenText(gc, lines[i], availableWidth);
extent.x = Math.max(extent.x, getTotalSize(null, lines[i]).x);
} else {
extent.x = Math.max(extent.x, e.x);
}
}
if (appToolTipText == null) {
super.setToolTipText(text);
}
} else {
super.setToolTipText(appToolTipText);
}
// determine horizontal position
int x = rect.x + leftMargin;
if (align == SWT.CENTER) {
x = (rect.width - extent.x) / 2;
}
if (align == SWT.RIGHT) {
x = rect.width - rightMargin - extent.x;
}
// draw a background image behind the text
try {
if (backgroundImage != null) {
// draw a background image behind the text
Rectangle imageRect = backgroundImage.getBounds();
// tile image to fill space
gc.setBackground(getBackground());
gc.fillRectangle(rect);
int xPos = 0;
while (xPos < rect.width) {
int yPos = 0;
while (yPos < rect.height) {
gc.drawImage(backgroundImage, xPos, yPos);
yPos += imageRect.height;
}
xPos += imageRect.width;
}
} else if (gradientColors != null) {
// draw a gradient behind the text
final Color oldBackground = gc.getBackground();
if (gradientColors.length == 1) {
if (gradientColors[0] != null) gc.setBackground(gradientColors[0]);
gc.fillRectangle(0, 0, rect.width, rect.height);
} else {
final Color oldForeground = gc.getForeground();
Color lastColor = gradientColors[0];
if (lastColor == null) lastColor = oldBackground;
int pos = 0;
for (int i = 0; i < gradientPercents.length; ++i) {
gc.setForeground(lastColor);
lastColor = gradientColors[i + 1];
if (lastColor == null) lastColor = oldBackground;
gc.setBackground(lastColor);
if (gradientVertical) {
final int gradientHeight = (gradientPercents[i] * rect.height / 100) - pos;
gc.fillGradientRectangle(0, pos, rect.width, gradientHeight, true);
pos += gradientHeight;
} else {
final int gradientWidth = (gradientPercents[i] * rect.width / 100) - pos;
gc.fillGradientRectangle(pos, 0, gradientWidth, rect.height, false);
pos += gradientWidth;
}
}
if (gradientVertical && pos < rect.height) {
gc.setBackground(getBackground());
gc.fillRectangle(0, pos, rect.width, rect.height - pos);
}
if (!gradientVertical && pos < rect.width) {
gc.setBackground(getBackground());
gc.fillRectangle(pos, 0, rect.width - pos, rect.height);
}
gc.setForeground(oldForeground);
}
gc.setBackground(oldBackground);
} else {
if (background != null || (getStyle() & SWT.DOUBLE_BUFFERED) == 0) {
gc.setBackground(getBackground());
gc.fillRectangle(rect);
}
}
} catch (SWTException e) {
if ((getStyle() & SWT.DOUBLE_BUFFERED) == 0) {
gc.setBackground(getBackground());
gc.fillRectangle(rect);
}
}
// draw border
int style = getStyle();
if ((style & SWT.SHADOW_IN) != 0 || (style & SWT.SHADOW_OUT) != 0) {
paintBorder(gc, rect);
}
/*
* Compute text height and image height. If image height is more than
* the text height, draw image starting from top margin. Else draw text
* starting from top margin.
*/
Rectangle imageRect = null;
int lineHeight = 0, textHeight = 0, imageHeight = 0;
if (img != null) {
imageRect = img.getBounds();
imageHeight = imageRect.height;
}
if (lines != null) {
lineHeight = gc.getFontMetrics().getHeight();
textHeight = lines.length * lineHeight;
}
int imageY = 0, midPoint = 0, lineY = 0;
if (imageHeight > textHeight) {
if (topMargin == DEFAULT_MARGIN && bottomMargin == DEFAULT_MARGIN)
imageY = rect.y + (rect.height - imageHeight) / 2;
else imageY = topMargin;
midPoint = imageY + imageHeight / 2;
lineY = midPoint - textHeight / 2;
} else {
if (topMargin == DEFAULT_MARGIN && bottomMargin == DEFAULT_MARGIN)
lineY = rect.y + (rect.height - textHeight) / 2;
else lineY = topMargin;
midPoint = lineY + textHeight / 2;
imageY = midPoint - imageHeight / 2;
}
// draw the image
if (img != null) {
gc.drawImage(
img, 0, 0, imageRect.width, imageHeight, x, imageY, imageRect.width, imageHeight);
x += imageRect.width + GAP;
extent.x -= imageRect.width + GAP;
}
// draw the text
if (lines != null) {
gc.setForeground(getForeground());
for (int i = 0; i < lines.length; i++) {
int lineX = x;
if (lines.length > 1) {
if (align == SWT.CENTER) {
int lineWidth = gc.textExtent(lines[i], DRAW_FLAGS).x;
lineX = x + Math.max(0, (extent.x - lineWidth) / 2);
}
if (align == SWT.RIGHT) {
int lineWidth = gc.textExtent(lines[i], DRAW_FLAGS).x;
lineX = Math.max(x, rect.x + rect.width - rightMargin - lineWidth);
}
}
gc.drawText(lines[i], lineX, lineY, DRAW_FLAGS);
lineY += lineHeight;
}
}
}
