Examples of org.eclipse.swt.graphics.GC

org.eclipse.swt.graphics.GC
se.org/swt/snippets/#gc">GC snippets @see SWT Examples: GraphicsExample, PaintExample @see Sample code and further information

      @Override
      public void controlResized(ControlEvent e) {
        Rectangle clArea = titleCircle.getClientArea();
        Image oldBgImage = fTitleBgImage;
        fTitleBgImage = new Image(titleCircle.getDisplay(), clArea.width, clArea.height);
        GC gc = new GC(fTitleBgImage);


        /* Gradient */
        drawGradient(gc, clArea);


        /* Fix Region Shape */
        fixRegion(gc, clArea);


        gc.dispose();


        titleCircle.setBackgroundImage(fTitleBgImage);


        if (oldBgImage != null)
          oldBgImage.dispose();
      }


      private void drawGradient(GC gc, Rectangle clArea) {
        gc.setForeground(fNotifierColors.getGradientBegin());
        gc.setBackground(fNotifierColors.getGradientEnd());
        gc.fillGradientRectangle(clArea.x, clArea.y, clArea.width, clArea.height, true);
      }


      private void fixRegion(GC gc, Rectangle clArea) {
        gc.setForeground(fNotifierColors.getBorder());


        /* Fill Top Left */
        gc.drawPoint(2, 0);
        gc.drawPoint(3, 0);
        gc.drawPoint(1, 1);
        gc.drawPoint(0, 2);
        gc.drawPoint(0, 3);


        /* Fill Top Right */
        gc.drawPoint(clArea.width - 4, 0);
        gc.drawPoint(clArea.width - 3, 0);
        gc.drawPoint(clArea.width - 2, 1);
        gc.drawPoint(clArea.width - 1, 2);
        gc.drawPoint(clArea.width - 1, 3);
      }
    });


    /* Title Label displaying RSSOwl */
    fTitleCircleLabel = new CLabel(titleCircle, SWT.NO_FOCUS);
    fTitleCircleLabel.setImage(OwlUI.getImage(fResources, "icons/product/24x24.png")); //$NON-NLS-1$
    fTitleCircleLabel.setText("RSSOwl"); //$NON-NLS-1$
    fTitleCircleLabel.setFont(fBoldTextFont);
    fTitleCircleLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, true));
    fTitleCircleLabel.addMouseTrackListener(fMouseTrackListner);
    fTitleCircleLabel.setCursor(fShell.getDisplay().getSystemCursor(SWT.CURSOR_HAND));
    fTitleCircleLabel.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseUp(MouseEvent e) {
        doRestore();
      }
    });


    /* CLabel to display a cross to close the popup */
    final CLabel closeButton = new CLabel(titleCircle, SWT.NO_FOCUS);
    closeButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));
    closeButton.setImage(fCloseImageNormal);
    closeButton.setCursor(fShell.getDisplay().getSystemCursor(SWT.CURSOR_HAND));
    closeButton.addMouseTrackListener(fMouseTrackListner);
    closeButton.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseUp(MouseEvent e) {
        doClose();
      }


      @Override
      public void mouseDown(MouseEvent e) {
        closeButton.setImage(fCloseImagePressed);
      }
    });


    closeButton.addMouseTrackListener(new MouseTrackAdapter() {
      @Override
      public void mouseEnter(MouseEvent e) {
        closeButton.setImage(fCloseImageHot);
      }


      @Override
      public void mouseExit(MouseEvent e) {
        closeButton.setImage(fCloseImageNormal);
      }
    });


    /* Outer composite to hold content controlls */
    fOuterContentCircle = new Composite(outerCircle, SWT.NONE);
    fOuterContentCircle.setLayout(LayoutUtils.createGridLayout(1, 0, 0));
    fOuterContentCircle.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    fOuterContentCircle.setBackground(outerCircle.getBackground());


    /* Middle composite to show a 1px black line around the content controlls */
    Composite middleContentCircle = new Composite(fOuterContentCircle, SWT.NO_FOCUS);
    middleContentCircle.setLayout(LayoutUtils.createGridLayout(1, 0, 0));
    ((GridLayout) middleContentCircle.getLayout()).marginTop = 1;
    ((GridLayout) middleContentCircle.getLayout()).marginBottom = 1;
    middleContentCircle.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    middleContentCircle.setBackground(fNotifierColors.getBorder());


    /* Inner composite containing the content controlls */
    fInnerContentCircle = new Composite(middleContentCircle, SWT.NO_FOCUS);
    fInnerContentCircle.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    fInnerContentCircle.setLayout(LayoutUtils.createGridLayout(4, 0, 5, 0, 0, false));
    ((GridLayout) fInnerContentCircle.getLayout()).marginLeft = 5;
    ((GridLayout) fInnerContentCircle.getLayout()).marginRight = 2;
    fInnerContentCircle.addMouseTrackListener(fMouseTrackListner);
    fInnerContentCircle.setBackground(fShell.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));


    /* Footer Area containing navigational controls */
    final Composite footerCircle = new Composite(outerCircle, SWT.NO_FOCUS);
    footerCircle.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
    footerCircle.setBackgroundMode(SWT.INHERIT_FORCE);
    footerCircle.setLayout(LayoutUtils.createGridLayout(3, 3, 0, 5, 3, false));
    footerCircle.addMouseTrackListener(fMouseTrackListner);
    footerCircle.addControlListener(new ControlAdapter() {
      @Override
      public void controlResized(ControlEvent e) {
        Rectangle clArea = footerCircle.getClientArea();
        Image oldBgImage = fFooterBgImage;
        fFooterBgImage = new Image(footerCircle.getDisplay(), clArea.width, clArea.height);
        GC gc = new GC(fFooterBgImage);


        /* Gradient */
        drawGradient(gc, clArea);


        /* Fix Region Shape */
        fixRegion(gc, clArea);


        gc.dispose();


        footerCircle.setBackgroundImage(fFooterBgImage);


        if (oldBgImage != null)
          oldBgImage.dispose();
      }


      private void drawGradient(GC gc, Rectangle clArea) {
        gc.setBackground(fNotifierColors.getGradientBegin());
        gc.setForeground(fNotifierColors.getGradientEnd());
        gc.fillGradientRectangle(clArea.x, clArea.y, clArea.width, clArea.height, true);
      }


      private void fixRegion(GC gc, Rectangle clArea) {
        gc.setForeground(fNotifierColors.getBorder());


        /* Fill Bottom Left */
        gc.drawPoint(2, clArea.height - 0);
        gc.drawPoint(3, clArea.height - 0);
        gc.drawPoint(1, clArea.height - 1);
        gc.drawPoint(0, clArea.height - 2);
        gc.drawPoint(0, clArea.height - 3);


        /* Fill Bottom Right */
        gc.drawPoint(clArea.width - 4, clArea.height - 0);
        gc.drawPoint(clArea.width - 3, clArea.height - 0);
        gc.drawPoint(clArea.width - 2, clArea.height - 1);
        gc.drawPoint(clArea.width - 1, clArea.height - 2);
        gc.drawPoint(clArea.width - 1, clArea.height - 3);
      }
    });


    /* Title Label displaying RSSOwl */
    fFooterCircleLabel = new CLabel(footerCircle, SWT.NO_FOCUS);

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      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;
  }

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      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 + hIndent;
    if (align == SWT.CENTER) {
      x = (rect.width - extent.x) / 2;
    }
    if (align == SWT.RIGHT) {
      x = rect.width - hIndent - 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);
        }


        if (roundRectangleBackground != null) {
          Color oldBackground = gc.getBackground();
          gc.setBackground(roundRectangleBackground);
          gc.fillRoundRectangle(rect.x, rect.y, rect.width, rect.height, 10, 50);
          if (oldBackground != null)
            gc.setBackground(oldBackground);
        }
      }
    } 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);
    }


    // draw the image
    if (img != null) {
      Rectangle imageRect = img.getBounds();
      gc.drawImage(img, 0, 0, imageRect.width, imageRect.height, x, (rect.height - imageRect.height) / 2, imageRect.width, imageRect.height);
      x += imageRect.width + GAP;
      extent.x -= imageRect.width + GAP;
    }
    // draw the text
    if (lines != null) {
      int lineHeight = gc.getFontMetrics().getHeight();
      int textHeight = lines.length * lineHeight;
      int lineY = Math.max(vIndent, rect.y + (rect.height - textHeight) / 2);
      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 - hIndent - lineWidth);
          }
        }
        gc.drawText(lines[i], lineX, lineY, DRAW_FLAGS);
        lineY += lineHeight;
      }
    }
  }

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      fItemViewer.getControl().addListener(SWT.EraseItem, new Listener() {
        public void handleEvent(Event event) {
          ToolBarItem item = (ToolBarItem) event.item.getData();
          if (item.item == CoolBarItem.SEPARATOR) {
            Scrollable scrollable = (Scrollable) event.widget;
            GC gc = event.gc;


            Rectangle area = scrollable.getClientArea();
            Rectangle rect = event.getBounds();


            /* Paint the selection beyond the end of last column */
            OwlUI.codExpandRegion(event, scrollable, gc, area);


            /* Draw Gradient Rectangle */
            Color oldForeground = gc.getForeground();
            Color oldBackground = gc.getBackground();


            /* Gradient */
            gc.setBackground(fSeparatorBg);
            gc.fillRectangle(0, rect.y, area.width, rect.height);


            /* Top / Bottom Line */
            gc.setForeground(fSeparatorBorderFg);
            gc.drawLine(0, rect.y + rect.height - 1, area.width, rect.y + rect.height - 1);
            gc.drawLine(0, rect.y, area.width, rect.y);


            gc.setForeground(oldForeground);
            gc.setBackground(oldBackground);


            /* Mark as Background being handled */
            event.detail &= ~SWT.BACKGROUND;
          }
        }

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      public void modifyText(ModifyEvent e) {
        setErrorMessage(null);
      }
    });


    GC gc = new GC(fNameInput);
    gc.setFont(JFaceResources.getDialogFont());
    FontMetrics fontMetrics = gc.getFontMetrics();
    int entryFieldWidth = Dialog.convertHorizontalDLUsToPixels(fontMetrics, IDialogConstants.ENTRY_FIELD_WIDTH);
    gc.dispose();


    ((GridData) fNameInput.getLayoutData()).widthHint = entryFieldWidth; //Required to avoid large spanning dialog for long Links


    ToolBar generateTitleBar = new ToolBar(nameContainer, SWT.FLAT);
    OwlUI.makeAccessible(generateTitleBar, Messages.NewsFilterDialog_CREATE_NAME_FROM_CONDITIONS);

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    conditionsContainer.setLayout(LayoutUtils.createGridLayout(2, 5, 10));
    conditionsContainer.setBackground(container.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
    conditionsContainer.setBackgroundMode(SWT.INHERIT_FORCE);
    conditionsContainer.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        GC gc = e.gc;
        Rectangle clArea = conditionsContainer.getClientArea();
        gc.setForeground(conditionsContainer.getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW));
        gc.drawLine(clArea.x, clArea.y, clArea.x + clArea.width, clArea.y);
        gc.drawLine(clArea.x, clArea.y + clArea.height - 1, clArea.x + clArea.width, clArea.y + clArea.height - 1);
      }
    });


    /* Search Conditions List */
    fSearchConditionList = new SearchConditionList(conditionsContainer, SWT.None, getDefaultConditions(), fExcludedConditions);

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    actionsContainer.setLayout(LayoutUtils.createGridLayout(2, 5, 10));
    actionsContainer.setBackground(container.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
    actionsContainer.setBackgroundMode(SWT.INHERIT_FORCE);
    actionsContainer.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        GC gc = e.gc;
        Rectangle clArea = actionsContainer.getClientArea();
        gc.setForeground(actionsContainer.getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW));
        gc.drawLine(clArea.x, clArea.y, clArea.x + clArea.width, clArea.y);
      }
    });


    /* Action List */
    fFilterActionList = new NewsActionList(actionsContainer, SWT.NONE, getDefaultActions());

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  }


  private void eraseGroup(Event event, EntityGroup group) {
    Scrollable scrollable = (Scrollable) event.widget;
    GC gc = event.gc;


    /* Draw Color if Selected */
    if (group.getColorHint() != null && (event.detail & SWT.SELECTED) != 0) {


      /* Some conditions under which we don't override the selection color */
      if (!scrollable.isFocusControl() || isInvalidColor(group.getColorHint()))
        return;


      Rectangle clArea = scrollable.getClientArea();
      Rectangle itemRect = event.getBounds();


      /* Paint the selection beyond the end of last column */
      OwlUI.codExpandRegion(event, scrollable, gc, clArea);


      /* Draw Rectangle */
      Color oldBackground = gc.getBackground();
      gc.setBackground(OwlUI.getColor(fResources, group.getColorHint()));
      gc.fillRectangle(0, itemRect.y, clArea.width, itemRect.height);
      gc.setBackground(oldBackground);
      gc.setForeground(scrollable.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));


      /* Mark as Selected being handled */
      event.detail &= ~SWT.SELECTED;
    }

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      OwlUI.codDrawGradient(event, fGradientFgColor, fGradientBgColor, fGradientEndColor);
  }


  private void eraseNews(Event event, INews news) {
    Scrollable scrollable = (Scrollable) event.widget;
    GC gc = event.gc;


    /* Handle selected News (Linux: Note Bug 444) */
    if ((event.detail & SWT.SELECTED) != 0 && (Application.IS_WINDOWS || !news.isFlagged())) {


      /* Do not override selection color if not focus control */
      if (!scrollable.isFocusControl())
        return;


      /* Load Labels */
      Set<ILabel> labels = CoreUtils.getSortedLabels(news);
      if (labels.isEmpty())
        return;


      ILabel label = labels.iterator().next();
      if (isInvalidColor(label))
        return;


      Rectangle clArea = scrollable.getClientArea();
      Rectangle itemRect = event.getBounds();


      /* Paint the selection beyond the end of last column */
      OwlUI.codExpandRegion(event, scrollable, gc, clArea);


      /* Draw Rectangle */
      Color oldBackground = gc.getBackground();
      gc.setBackground(OwlUI.getColor(fResources, label));
      gc.fillRectangle(0, itemRect.y, clArea.width, itemRect.height);
      gc.setBackground(oldBackground);
      gc.setForeground(scrollable.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));


      /* Mark as Selected being handled */
      event.detail &= ~SWT.SELECTED;
    }


    /* Handle Non-Selected flagged News */
    else if (news.isFlagged()) {
      Rectangle clArea = scrollable.getClientArea();
      Rectangle itemRect = event.getBounds();


      /* Paint the selection beyond the end of last column */
      OwlUI.codExpandRegion(event, scrollable, gc, clArea);


      /* Draw Rectangle */
      Color oldBackground = gc.getBackground();
      gc.setBackground(fStickyBgColor);
      gc.fillRectangle(0, itemRect.y, clArea.width, itemRect.height);
      gc.setBackground(oldBackground);


      /* Mark as Background being handled */
      event.detail &= ~SWT.BACKGROUND;
    }

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    conditionsContainer.setLayout(LayoutUtils.createGridLayout(2, 5, 10));
    conditionsContainer.setBackground(container.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
    conditionsContainer.setBackgroundMode(SWT.INHERIT_FORCE);
    conditionsContainer.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        GC gc = e.gc;
        Rectangle clArea = conditionsContainer.getClientArea();
        gc.setForeground(conditionsContainer.getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW));
        gc.drawLine(clArea.x, clArea.y, clArea.x + clArea.width, clArea.y);
      }
    });


    /* Search Conditions List */
    fSearchConditionList = new SearchConditionList(conditionsContainer, SWT.None, getDefaultConditions());

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