下面列出了javax.swing.JViewport#setViewPosition ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* Forces the table to resize given column.
*/
private void resize(int newWidth, JTable table) {
int oldWidth = getWidth();
JTableHeader header = table.getTableHeader();
if (header == null) {
return;
}
header.setResizingColumn(this);
final int oldMin = getMinWidth();
final int oldMax = getMaxWidth();
setMinWidth(newWidth);
setMaxWidth(newWidth);
setWidth(newWidth);
// The trick is to restore the original values
// after the table has be layouted. During layout this column
// has fixed width (by setting min==max==preffered)
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
setMinWidth(oldMin);
setMaxWidth(oldMax);
}
});
Container container;
if ((header.getParent() == null) ||
((container = header.getParent().getParent()) == null) ||
!(container instanceof JScrollPane)) {
header.setResizingColumn(null);
return;
}
if (!container.getComponentOrientation().isLeftToRight() &&
! header.getComponentOrientation().isLeftToRight()) {
if (table != null) {
JViewport viewport = ((JScrollPane)container).getViewport();
int viewportWidth = viewport.getWidth();
int diff = newWidth - oldWidth;
int newHeaderWidth = table.getWidth() + diff;
/* Resize a table */
Dimension tableSize = table.getSize();
tableSize.width += diff;
table.setSize(tableSize);
/* If this table is in AUTO_RESIZE_OFF mode and
* has a horizontal scrollbar, we need to update
* a view's position.
*/
if ((newHeaderWidth >= viewportWidth) &&
(table.getAutoResizeMode() == JTable.AUTO_RESIZE_OFF)) {
Point p = viewport.getViewPosition();
p.x = Math.max(0, Math.min(newHeaderWidth - viewportWidth, p.x + diff));
viewport.setViewPosition(p);
}
}
}
header.setResizingColumn(null);
}
/** notify the Component to autoscroll */
public void autoscroll(Point cursorLoc) {
JViewport viewport = getViewport();
Point viewPos = viewport.getViewPosition();
int viewHeight = viewport.getExtentSize().height;
if ((cursorLoc.y - viewPos.y) <= realInsets.top) {
// scroll up
viewport.setViewPosition(new Point(viewPos.x, Math.max(viewPos.y - realInsets.top, 0)));
} else if (((viewPos.y + viewHeight) - cursorLoc.y) <= realInsets.bottom) {
// scroll down
viewport.setViewPosition(
new Point(viewPos.x, Math.min(viewPos.y + realInsets.bottom, this.getHeight() - viewHeight))
);
}
}
private void changed() {
JViewport viewport = sp.getViewport();
Point viewPosition = viewport.getViewPosition();
if (viewPosition.x > 0) {
try {
Rectangle textRect = editorPane.getUI().modelToView(editorPane, editorPane.getDocument().getLength());
int textLength = textRect.x + textRect.width;
int viewLength = viewport.getExtentSize().width;
//System.out.println("Utilities.createSingleLineEditor(): spLength = "+sp.getSize().width+", viewLength = "+viewLength+", textLength = "+textLength+", viewPosition = "+viewPosition);
if (textLength < (viewPosition.x + viewLength)) {
viewPosition.x = Math.max(textLength - viewLength, 0);
viewport.setViewPosition(viewPosition);
//System.out.println("Utilities.createSingleLineEditor(): setting new view position = "+viewPosition);
}
} catch (BadLocationException blex) {
Exceptions.printStackTrace(blex);
}
}
}
@Override
public void mouseWheelMoved(MouseWheelEvent e) {
final JViewport scrollpane = (JViewport) getParent();
final Point pos = scrollpane.getViewPosition();
final int y;
final int SCROLL_HEIGHT = 50;
if (e.getWheelRotation() < 0) {
y = pos.y - (e.getScrollAmount() * SCROLL_HEIGHT);
} else {
y = pos.y + (e.getScrollAmount() * SCROLL_HEIGHT);
}
scrollpane.setViewPosition(new Point(0, Math.max(0, y)));
}
void pnlLinksMouseDragged(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_pnlLinksMouseDragged
// Add your handling code here:
Container container = pnlInScroll.getParent();
if (container instanceof JViewport)
{
JViewport viewport = (JViewport) container;
Point point = viewport.getViewPosition();
int newX = point.x - (evt.getX() - downX);
int newY = point.y - (evt.getY() - downY);
int maxX = pnlInScroll.getWidth() - viewport.getWidth();
int maxY = pnlInScroll.getHeight() - viewport.getHeight();
if (newX < 0)
{
newX = 0;
}
if (newX > maxX)
{
newX = maxX;
}
if (newY < 0)
{
newY = 0;
}
if (newY > maxY)
{
newY = maxY;
}
viewport.setViewPosition(new Point(newX, newY));
}
}
/** Performs autoscroll operation.
*/
public void autoscroll(Point cursorLoc) {
JViewport viewport = getViewport();
if (viewport == null) {
return;
}
Point viewPos = viewport.getViewPosition();
int viewHeight = viewport.getExtentSize().height;
int viewWidth = viewport.getExtentSize().width;
// perform scrolling
if ((cursorLoc.y - viewPos.y) < insets.top) {
// scroll up
viewport.setViewPosition(new Point(viewPos.x, Math.max(viewPos.y - scrollUnits.top, 0)));
} else if (((viewPos.y + viewHeight) - cursorLoc.y) < insets.bottom) {
// scroll down
viewport.setViewPosition(
new Point(viewPos.x, Math.min(viewPos.y + scrollUnits.bottom, comp.getHeight() - viewHeight))
);
} else if ((cursorLoc.x - viewPos.x) < insets.left) {
// scroll left
viewport.setViewPosition(new Point(Math.max(viewPos.x - scrollUnits.left, 0), viewPos.y));
} else if (((viewPos.x + viewWidth) - cursorLoc.x) < insets.right) {
// scroll right
viewport.setViewPosition(
new Point(Math.min(viewPos.x + scrollUnits.right, comp.getWidth() - viewWidth), viewPos.y)
);
}
}
private void refreshDisplayPane() {
JPanel pdfImagePanel = pdfDisplay.drawPreviewOnJPanel();
if (pdfImagePanel != null) {
JViewport vp = jScrollPane1.getViewport();
Point p = vp.getViewPosition();
vp.setView(pdfImagePanel);
vp.setViewPosition(p);
}
jTextField1.setText(String.valueOf(pdfDisplay.getSelectedPage()));
jLabel2.setText("of " + pdfDisplay.getTotalPages());
}
void setExtentPosition(int x, int y) {
JViewport port = getParentViewport();
if (port != null) {
Point p = new Point(Math.max(x, 0), Math.max(y, 0));
port.setViewPosition(p);
}
}
/** Performs autoscroll operation.
*/
public void autoscroll(Point cursorLoc) {
JViewport viewport = getViewport();
if (viewport == null) {
return;
}
Point viewPos = viewport.getViewPosition();
int viewHeight = viewport.getExtentSize().height;
int viewWidth = viewport.getExtentSize().width;
// perform scrolling
if ((cursorLoc.y - viewPos.y) < insets.top) {
// scroll up
viewport.setViewPosition(new Point(viewPos.x, Math.max(viewPos.y - scrollUnits.top, 0)));
} else if (((viewPos.y + viewHeight) - cursorLoc.y) < insets.bottom) {
// scroll down
viewport.setViewPosition(
new Point(viewPos.x, Math.min(viewPos.y + scrollUnits.bottom, comp.getHeight() - viewHeight))
);
} else if ((cursorLoc.x - viewPos.x) < insets.left) {
// scroll left
viewport.setViewPosition(new Point(Math.max(viewPos.x - scrollUnits.left, 0), viewPos.y));
} else if (((viewPos.x + viewWidth) - cursorLoc.x) < insets.right) {
// scroll right
viewport.setViewPosition(
new Point(Math.min(viewPos.x + scrollUnits.right, comp.getWidth() - viewWidth), viewPos.y)
);
}
}
private void drawPreview() {
JPanel pdfImagePanel = pdfDisplay.drawPreviewOnJPanel();
if (pdfImagePanel != null) {
JViewport vp = jScrollPane.getViewport();
Point p = vp.getViewPosition();
vp.setView(pdfImagePanel);
vp.setViewPosition(p);
}
jLabel.setText("of " + pdfDisplay.getTotalPages());
}
private void adjustTreeScrollBar(int treeViewWidth) {
DebugTreeView tView = getTreeView();
if (tView == null) {
scrollBarPanel.setVisible(false);
return;
}
JViewport viewport = tView.getViewport();
Point point = viewport.getViewPosition();
if (point.y < 0) {
viewport.setViewPosition(new Point(point.x, 0));
}
Dimension viewSize = viewport.getExtentSize();
Dimension treeSize = viewport.getViewSize();
if (treeViewWidth < 0) {
treeViewWidth = treeSize.width;
}
int unitHeight = tView.getUnitHeight();
if (unitHeight > 0) {
JScrollBar sbar = mainScrollPane.getVerticalScrollBar();
if (sbar.getUnitIncrement() != unitHeight) {
sbar.setUnitIncrement(unitHeight);
}
}
if (treeViewWidth <= viewSize.width) {
scrollBarPanel.setVisible(false);
} else {
treeScrollBar.setMaximum(treeViewWidth);
treeScrollBar.setVisibleAmount(viewSize.width);
if (unitHeight > 0) {
treeScrollBar.setUnitIncrement(unitHeight / 2);
}
treeScrollBar.setBlockIncrement(viewSize.width);
scrollBarPanel.setVisible(true);
} // else
}
@Override
public void adjustmentValueChanged(AdjustmentEvent e) {
DebugTreeView tView = getTreeView();
if (tView == null) {
return;
}
JViewport viewport = tView.getViewport();
Point position = viewport.getViewPosition();
viewport.setViewPosition(new Point(e.getValue(), position.y));
}
private void hsbStateChanged(JViewport viewport, ChangeEvent e) {
BoundedRangeModel model = (BoundedRangeModel) (e.getSource());
Point p = viewport.getViewPosition();
int value = model.getValue();
if (scrollpane.getComponentOrientation().isLeftToRight()) {
p.x = value;
} else {
int max = viewport.getViewSize().width;
int extent = viewport.getExtentSize().width;
int oldX = p.x;
/*
* Set new X coordinate based on "value".
*/
p.x = max - extent - value;
/*
* If setValue() was called before "extent" was fixed, turn
* setValueCalled flag on.
*/
if ((extent == 0) && (value != 0) && (oldX == max)) {
setValueCalled = true;
} else {
/*
* When a pane without a horizontal scroll bar was reduced
* and the bar appeared, the viewport should show the right
* side of the view.
*/
if ((extent != 0) && (oldX < 0) && (p.x == 0)) {
p.x += value;
}
}
}
viewport.setViewPosition(p);
}
private void scroll() {
Point point = new Point(0, (int) (jTextPane1.getSize().getHeight()));
JViewport vp = jScrollPane1.getViewport();
if (vp == null) {
return;
}
vp.setViewPosition(point);
}
private void scroll() {
Point point = new Point(0, (int) (jTextPane1.getSize().getHeight()));
JViewport vp = jScrollPane1.getViewport();
if ((vp == null) || (point == null)) {
return;
}
vp.setViewPosition(point);
}
private void scroll() {
Point point = new Point(0, (int) (jTextPane1.getSize().getHeight()));
JViewport vp = jScrollPane1.getViewport();
if ((vp == null) || (point == null)) {
return;
}
vp.setViewPosition(point);
}
private void scroll() {
Point point = new Point(0, (int) (jTextPane1.getSize().getHeight()));
JViewport vp = jScrollPane1.getViewport();
if ((vp == null) || (point == null)) {
return;
}
vp.setViewPosition(point);
}
public void mouseDragged(MouseEvent e) {
int mouseX = e.getX();
TableColumn resizingColumn = table.getTableHeader().getResizingColumn();
boolean headerLeftToRight =
table.getTableHeader().getComponentOrientation().isLeftToRight();
if (resizingColumn != null) {
int oldWidth = resizingColumn.getWidth();
int newWidth;
if (headerLeftToRight) {
newWidth = mouseX - mouseXOffset;
} else {
newWidth = mouseXOffset - mouseX;
}
resizingColumn.setWidth(newWidth);
Container container;
if ((table.getTableHeader().getParent() == null)
|| ((container = table.getTableHeader().getParent().getParent()) == null)
|| !(container instanceof JScrollPane)) {
return;
}
if (!container.getComponentOrientation().isLeftToRight()
&& !headerLeftToRight) {
if (table != null) {
JViewport viewport = ((JScrollPane)container).getViewport();
int viewportWidth = viewport.getWidth();
int diff = newWidth - oldWidth;
int newHeaderWidth = table.getWidth() + diff;
/* Resize a table */
Dimension tableSize = table.getSize();
tableSize.width += diff;
table.setSize(tableSize);
/*
* If this table is in AUTO_RESIZE_OFF mode and has a horizontal
* scrollbar, we need to update a view's position.
*/
if ((newHeaderWidth >= viewportWidth)
&& (table.getAutoResizeMode() == JTable.AUTO_RESIZE_OFF)) {
Point p = viewport.getViewPosition();
p.x =
Math.max(0, Math.min(newHeaderWidth - viewportWidth, p.x + diff));
viewport.setViewPosition(p);
/* Update the original X offset value. */
mouseXOffset += diff;
}
}
}
}
}
/**
* Sets the position of the viewport
*/
void set_viewport_position(java.awt.Point p_position)
{
JViewport viewport = scroll_pane.getViewport();
viewport.setViewPosition(p_position);
}
public void mouseDragged(MouseEvent e) {
int mouseX = e.getX();
TableColumn resizingColumn = table.getTableHeader().getResizingColumn();
boolean headerLeftToRight =
table.getTableHeader().getComponentOrientation().isLeftToRight();
if (resizingColumn != null) {
int oldWidth = resizingColumn.getWidth();
int newWidth;
if (headerLeftToRight) {
newWidth = mouseX - mouseXOffset;
} else {
newWidth = mouseXOffset - mouseX;
}
resizingColumn.setWidth(newWidth);
Container container;
if ((table.getTableHeader().getParent() == null)
|| ((container = table.getTableHeader().getParent().getParent()) == null)
|| !(container instanceof JScrollPane)) {
return;
}
if (!container.getComponentOrientation().isLeftToRight()
&& !headerLeftToRight) {
if (table != null) {
JViewport viewport = ((JScrollPane)container).getViewport();
int viewportWidth = viewport.getWidth();
int diff = newWidth - oldWidth;
int newHeaderWidth = table.getWidth() + diff;
/* Resize a table */
Dimension tableSize = table.getSize();
tableSize.width += diff;
table.setSize(tableSize);
/*
* If this table is in AUTO_RESIZE_OFF mode and has a horizontal
* scrollbar, we need to update a view's position.
*/
if ((newHeaderWidth >= viewportWidth)
&& (table.getAutoResizeMode() == JTable.AUTO_RESIZE_OFF)) {
Point p = viewport.getViewPosition();
p.x =
Math.max(0, Math.min(newHeaderWidth - viewportWidth, p.x + diff));
viewport.setViewPosition(p);
/* Update the original X offset value. */
mouseXOffset += diff;
}
}
}
}
}