/** 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; }
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; } } }