java.awt.event.MouseWheelEvent#isControlDown()源码实例Demo

@Override
public void mouseWheelMoved(MouseWheelEvent e) {
  if (e.isControlDown()) {
    int zoomLevel = zoomComboBox.getSelectedIndex();
    int notches = e.getWheelRotation();
    if (zoomLevel != -1) {
      if (notches < 0) {
        if (zoomLevel > 0) {
          zoomLevel--;
          zoomComboBox.setSelectedIndex(zoomLevel);
        }
      }
      else {
        if (zoomLevel < zoomComboBox.getItemCount() - 1) {
          zoomLevel++;
          zoomComboBox.setSelectedIndex(zoomLevel);
        }
      }
    }
  }
}
 

@Override
public void mouseWheelMoved(final MouseWheelEvent event) {
  final int ticks = Math.abs(event.getUnitsToScroll());

  // When the user holds down control, we switch between the two modes
  final boolean changeMode = event.isControlDown();

  for (int i = 0; i < ticks; ++i) {
    if (((m_zyGraph.getSettings().getMouseSettings().getMouseWheelAction() == MouseWheelAction.ZOOM) && !changeMode)
        || ((m_zyGraph.getSettings().getMouseSettings().getMouseWheelAction() == MouseWheelAction.SCROLL) && changeMode)) {
      handleInZoomMode(event);
    } else {
      handleInMoveMode(event);
    }
  }

  m_zyGraph.updateViews();
}
 

private void mouseWheel(MouseWheelEvent e) {
    if (!e.isControlDown()) {
        if (e.getWheelRotation() < 0 && currentLayer < maxLayer - 1) {
            currentLayer++;
        }
        if (e.getWheelRotation() > 0 && currentLayer > 0) {
            currentLayer--;
        }

        setCurrentLayer(currentLayer);
    } else {
        scaleByAmount(e.getUnitsToScroll() * -0.1);
    }
}
 

@Override
public void mouseWheelMoved(MouseWheelEvent e) {
    if (e.isControlDown()) {
        if (e.getWheelRotation() < 0) {
            erdesigner.commandZoomOneLevelIn();
        } else {
            erdesigner.commandZoomOneLevelOut();
        }
    }
}
 

public void mouseWheelMoved(MouseWheelEvent e) {
    if (e.isControlDown()) {
        if (e.getWheelRotation() < 0) {
            getEditor().ZoomMais();
        } else {
            getEditor().ZoomMenos();
        }
        e.consume();
    }
}
 

/**
 * Called when the mouse wheel is moved.
 * If CTRL key is down, modify current zoom ratio accordingly, otherwise
 * forward the wheel event to proper container (JScrollPane usually).
 *
 * @param e the mouse wheel event
 */
@Override
public void mouseWheelMoved (MouseWheelEvent e)
{
    // CTRL is down?
    if (e.isControlDown()) {
        double ratio = zoom.getRatio();

        if (e.getWheelRotation() > 0) {
            ratio /= factor;
        } else {
            ratio *= factor;
        }

        zoom.setRatio(ratio);
    } else {
        // Forward event to some container of the component?
        Container container = component.getParent();

        while (container != null) {
            if (container instanceof JComponent) {
                JComponent comp = (JComponent) container;
                MouseWheelListener[] listeners = comp.getMouseWheelListeners();

                if (listeners.length > 0) {
                    for (MouseWheelListener listener : listeners) {
                        listener.mouseWheelMoved(e);
                    }

                    return;
                }
            }

            container = container.getParent();
        }
    }
}
 

@Override
public void mouseWheelMoved(final MouseWheelEvent e) {
  if (e.isControlDown()) {
    final float newzoom;
    if (e.getPreciseWheelRotation() > 0) {
      newzoom = Math.max(1.0f, this.zoom - 0.2f);
    } else {
      newzoom = Math.min(5.0f, this.zoom + 0.2f);
    }
    if (newzoom != this.zoom) {
      updateZoom(newzoom);
    }
  }
}
 

/**
 * Called when the mouse wheel is moved.
 * If CTRL key is down, modify current zoom ratio accordingly, otherwise
 * forward the wheel event to proper container (JScrollPane usually).
 *
 * @param e the mouse wheel event
 */
@Override
public void mouseWheelMoved (MouseWheelEvent e)
{
    // CTRL is down?
    if (e.isControlDown()) {
        double ratio = zoom.getRatio();

        if (e.getWheelRotation() > 0) {
            ratio /= factor;
        } else {
            ratio *= factor;
        }

        zoom.setRatio(ratio);
    } else {
        // Forward event to some container of the component?
        Container container = component.getParent();

        while (container != null) {
            if (container instanceof JComponent) {
                JComponent comp = (JComponent) container;
                MouseWheelListener[] listeners = comp.getMouseWheelListeners();

                if (listeners.length > 0) {
                    for (MouseWheelListener listener : listeners) {
                        listener.mouseWheelMoved(e);
                    }

                    return;
                }
            }

            container = container.getParent();
        }
    }
}
 

@Override
public void mouseWheelMoved (MouseWheelEvent e)
{
    /*
     * java.awt.event.MouseWheelEvent
     * [MOUSE_WHEEL,(628,24),absolute(0,0),button=0,modifiers=Ctrl,extModifiers=Ctrl,clickCount=0,scrollType=WHEEL_UNIT_SCROLL,scrollAmount=3,wheelRotation=-1]
     * on javax.swing.JPanel[,0,0,800x30,layout=java.awt.FlowLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=]
     */

    //System.out.println("e: " + e);
    int scrollAmount = e.getScrollAmount();
    int     scrollType = e.getScrollType();
    int     unitsToScroll = e.getUnitsToScroll();
    int     wheelRotation = e.getWheelRotation();
    boolean ctrl = e.isControlDown();

    //        System.out.println(
    //            "CTRL:" + ctrl + " amount:" + scrollAmount + " type:" + scrollType +
    //            " units:" + unitsToScroll + " rotation:" + wheelRotation);
    if (ctrl) {
        double val = slider.getDoubleValue();

        System.out.println("val:" + val);

        if (wheelRotation > 0) {
            val /= factor;
        } else {
            val *= factor;
        }

        System.out.println("  val:" + val);

        slider.setDoubleValue(val);
    }
}
 

@Override
public void mouseWheelMoved(MouseWheelEvent e) {
    if (e.isAltDown() || e.isAltGraphDown() || e.isControlDown() || e.isShiftDown()) {
        return;
    }
    Viewport viewport = layerCanvas.getViewport();
    int wheelRotation = e.getWheelRotation();
    if (invertZooming) {
        wheelRotation *= -1;
    }
    double oldZoomFactor = viewport.getZoomFactor();
    double newZoomFactor = oldZoomFactor * Math.pow(1.1, wheelRotation);
    viewport.setZoomFactor(newZoomFactor);
}
 

@Override
public void mouseWheelMoved(final MouseWheelEvent e) {
	if (e.isControlDown() && e.getWheelRotation() != 0) {
		double oldZoomFactor = rendererView.getModel().getZoomFactor();
		if (e.getWheelRotation() < 0) {
			rendererView.getModel().zoomIn();
		} else {
			rendererView.getModel().zoomOut();
		}
		rendererView.getModel().fireProcessZoomChanged();

		// calculate how the scrollbar needs to be adjusted for centered zoom
		double relativeZoomFactor = rendererView.getModel().getZoomFactor() / oldZoomFactor;
		double differenceHorizontal = e.getPoint().getX() * (relativeZoomFactor - 1);
		double differenceVertical = e.getPoint().getY() * (relativeZoomFactor - 1);

		int newX = Math.max(0, (int) (scrollPane.getHorizontalScrollBar().getValue() + differenceHorizontal));
		int newY = Math.max(0, (int) (scrollPane.getVerticalScrollBar().getValue() + differenceVertical));

		scrollPane.getHorizontalScrollBar().setValue(newX);
		scrollPane.getVerticalScrollBar().setValue(newY);

		// prevent flickering when another adjustment of the scrollbars is needed
		RepaintManager.currentManager(scrollPane).markCompletelyClean(scrollPane);

		/**
		 * Setting the value as above does not always work since the scrollbars are not yet
		 * updated to the size changes caused by the zooming. Set flag an values to try
		 * again after the resizing happened.
		 */
		zoomed = true;
		desiredVerticalScrollValue = newY;
		desiredHorizontalScrollValue = newX;
		return;
	}

	Container p = rendererView.getParent();
	if (p != null) {
		p.dispatchEvent(SwingUtilities.convertMouseEvent(rendererView, e, p));
	}
}
 

public static boolean isChangeFontSize(@Nonnull MouseWheelEvent e) {
  if (e.getWheelRotation() == 0) return false;
  return SystemInfo.isMac ? !e.isControlDown() && e.isMetaDown() && !e.isAltDown() && !e.isShiftDown() : e.isControlDown() && !e.isMetaDown() && !e.isAltDown() && !e.isShiftDown();
}