private int getCorrectionOffset(FilePanel fp) {
JTextComponent editor;
int offset;
Rectangle rect;
Point p;
JViewport viewport;
editor = fp.getEditor();
viewport = fp.getScrollPane().getViewport();
p = viewport.getViewPosition();
offset = editor.viewToModel(p);
try {
// This happens when you scroll to the bottom. The upper line won't
// start at the right position (You can see half of the line)
// Correct this offset with the pane next to it to keep in sync.
rect = editor.modelToView(offset);
if (rect != null) {
return p.y - rect.getLocation().y;
}
} catch (Exception ex) {
ex.printStackTrace();
}
return 0;
}
private int getCurrentLineCenter(FilePanel fp) {
JScrollPane scrollPane;
BufferDocumentIF bd;
JTextComponent editor;
JViewport viewport;
int line;
Rectangle rect;
int offset;
Point p;
editor = fp.getEditor();
scrollPane = fp.getScrollPane();
viewport = scrollPane.getViewport();
p = viewport.getViewPosition();
offset = editor.viewToModel(p);
// Scroll around the center of the editpane
p.y += getHeightOffset(fp);
offset = editor.viewToModel(p);
bd = fp.getBufferDocument();
if (bd == null) {
return -1;
}
line = bd.getLineForOffset(offset);
return line;
}
public void scrollToLine(FilePanel fp, int line) {
JScrollPane scrollPane;
FilePanel fp2;
BufferDocumentIF bd;
JTextComponent editor;
JViewport viewport;
Rectangle rect;
int offset;
Point p;
Rectangle viewRect;
Dimension viewSize;
Dimension extentSize;
int x;
fp2 = fp == filePanelLeft ? filePanelRight : filePanelLeft;
bd = fp.getBufferDocument();
if (bd == null) {
return;
}
offset = bd.getOffsetForLine(line);
if (offset < 0) {
return;
}
viewport = fp.getScrollPane().getViewport();
editor = fp.getEditor();
try {
rect = editor.modelToView(offset);
if (rect == null) {
return;
}
p = rect.getLocation();
p.y -= getHeightOffset(fp);
p.y += getCorrectionOffset(fp2);
// Do not allow scrolling before the begin.
if (p.y < 0) {
p.y = 0;
}
// Do not allow scrolling after the end.
viewSize = viewport.getViewSize();
viewRect = viewport.getViewRect();
extentSize = viewport.getExtentSize();
if (p.y > viewSize.height - extentSize.height) {
p.y = viewSize.height - extentSize.height;
}
p.x = viewRect.x;
viewport.setViewPosition(p);
} catch (Exception ex) {
ex.printStackTrace();
}
}
private void init() {
JScrollBar o;
JScrollBar r;
// Synchronize the horizontal scrollbars:
o = filePanelLeft.getScrollPane().getHorizontalScrollBar();
r = filePanelRight.getScrollPane().getHorizontalScrollBar();
r.addAdjustmentListener(getHorizontalAdjustmentListener());
o.addAdjustmentListener(getHorizontalAdjustmentListener());
// Synchronize the vertical scrollbars:
o = filePanelLeft.getScrollPane().getVerticalScrollBar();
r = filePanelRight.getScrollPane().getVerticalScrollBar();
r.addAdjustmentListener(getVerticalAdjustmentListener());
o.addAdjustmentListener(getVerticalAdjustmentListener());
}
private int getHeightOffset(FilePanel fp) {
JScrollPane scrollPane;
JViewport viewport;
int offset;
int unitIncrement;
scrollPane = fp.getScrollPane();
viewport = scrollPane.getViewport();
offset = viewport.getSize().height / 2;
unitIncrement = scrollPane.getHorizontalScrollBar().getUnitIncrement();
offset = offset - (offset % unitIncrement);
return offset;
}