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gui: scroll with middle-button

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Hold-down middle button and drag to scroll map without using
scroll bars.  Contributed by askywhale (email, 2013-09-01)

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@850 d9718cc8-9f43-0410-858b-315f434eb58c
This commit is contained in:
jason@long.name 2013-09-07 15:18:38 +00:00
parent dc412a71b6
commit 436789c12e
1 changed files with 63 additions and 0 deletions
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63
src/micropolisj/gui/MicropolisDrawingArea.java
View file

@ -40,6 +40,8 @@ public class MicropolisDrawingArea extends JComponent
TileImages tileImages; TileImages tileImages;
int TILE_WIDTH; int TILE_WIDTH;
int TILE_HEIGHT; int TILE_HEIGHT;
int dragX, dragY;
boolean dragging;
public MicropolisDrawingArea(Micropolis engine) public MicropolisDrawingArea(Micropolis engine)
{ {
@ -56,6 +58,46 @@ public class MicropolisDrawingArea extends JComponent
} }
public void ancestorMoved(AncestorEvent evt) {} public void ancestorMoved(AncestorEvent evt) {}
}); });
addMouseListener(new MouseListener() {
@Override
public void mousePressed(MouseEvent e) {
if(e.getButton()==MouseEvent.BUTTON2)
startDrag(e.getX(), e.getY());
}
@Override
public void mouseReleased(MouseEvent e) {
if(e.getButton()==MouseEvent.BUTTON2)
endDrag(e.getX(), e.getY());
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mouseClicked(MouseEvent e) {
}
});
addMouseMotionListener(new MouseMotionListener() {
@Override
public void mouseMoved(MouseEvent e) {
}
@Override
public void mouseDragged(MouseEvent e) {
if(dragging)
continueDrag(e.getX(), e.getY());
}
});
} }
public void selectTileSize(int newTileSize) public void selectTileSize(int newTileSize)
@ -350,6 +392,27 @@ public class MicropolisDrawingArea extends JComponent
repaint(); repaint();
} }
protected void startDrag(int x, int y)
{
dragging = true;
dragX = x;
dragY = y;
}
protected void endDrag(int x, int y)
{
dragging = false;
}
protected void continueDrag(int x, int y)
{
int dx = x - dragX;
int dy = y - dragY;
JScrollPane js = (JScrollPane)getParent().getParent();
js.getHorizontalScrollBar().setValue(
js.getHorizontalScrollBar().getValue()-dx);
js.getVerticalScrollBar().setValue(
js.getVerticalScrollBar().getValue()-dy);
}
void doBlink() void doBlink()
{ {
if (!unpoweredZones.isEmpty()) if (!unpoweredZones.isEmpty())