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< > BotCompany Repo | #1035241 // ComponentResizeDragger - resize a GUI Component with mouse

JavaX fragment (include) [tags: use-pretranspiled]

Transpiled version (8265L) is out of date.

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// This class uses the border of the component that caught
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// the mouse event to determine the drag direction.
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sclass ComponentResizeDragger extends MouseAdapter {
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  Component component; // component to resize
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  int cornerSize = 10; // how big do we assume the corners are
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  settable bool debug;
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  MouseEvent mouseDownEvent; // if != null, we're engaged
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  JComponent src;
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  Rect originalPosition, srcBounds;
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  int dragX, dragY; // -1, 0 or 1 depending on what we are dragging
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  Cursor originalCursor, ourCursor;
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  *(Component *component, JComponent *src) {
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    addMouseAndMotionListener(src, this);
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  }
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  bool engaged() { ret mouseDownEvent != null; } 
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  void start(MouseEvent e) {
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    this.mouseDownEvent = e;
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    originalPosition = toRect(getBounds(component));
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    cursorCalc(e, true);
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  }
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  void cursorCalc(MouseEvent e, bool inside) {
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    srcBounds = toRect(boundsOnScreen(src));
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    Pt mouse = pt(e.getXOnScreen(), e.getYOnScreen());
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    if (distance(mouse.y, srcBounds.y2()) <= cornerSize)
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      dragY = 1;
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    else if (distance(mouse.y, srcBounds.y1()) <= cornerSize)
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      dragY = -1;
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    else
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      dragY = 0;
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    if (distance(mouse.x, srcBounds.x2()) <= cornerSize)
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      dragX = 1;
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    else if (distance(mouse.x, srcBounds.x1()) <= cornerSize)
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      dragX = -1;
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    else
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      dragX = 0;
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    originalCursor = src.getCursor();
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    int iCursor = dragY*3+dragX+4;
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    int cursor = new int[] {
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      Cursor.NW_RESIZE_CURSOR,
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      Cursor.N_RESIZE_CURSOR,
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      Cursor.NE_RESIZE_CURSOR,
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      Cursor.W_RESIZE_CURSOR,
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      -1,
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      Cursor.E_RESIZE_CURSOR,
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      Cursor.SW_RESIZE_CURSOR,
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      Cursor.S_RESIZE_CURSOR,
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      Cursor.SE_RESIZE_CURSOR,
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    }[iCursor];
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    Cursor newCursor = cursor >= 0 && inside ? Cursor.getPredefinedCursor(cursor) : null;
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    //if (debug) printVars(iCursor, +ourCursor, +newCursor);
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    if (newCursor != ourCursor) {
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      ourCursor = newCursor;
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      src.setCursor(newCursor);
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    }
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    /*if (debug)
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      printVars("WindowResizeDragger", +dragX, +dragY, +mouse, +srcBounds, +cornerSize);*/
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  }
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  @Override public void mouseEntered(MouseEvent e) {
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    if (debug) print("mouseEntered");
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    if (!engaged())
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      cursorCalc(e, true);
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  }
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  @Override public void mouseExited(MouseEvent e) {
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    if (debug) print("mouseExited");
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    if (!engaged())
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      cursorCalc(e, false);
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  }
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  public void mousePressed(MouseEvent e) {
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    if (e.getButton() != MouseEvent.BUTTON1) ret;
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    //if (component cast JFrame && isMaximized(component)) ret;
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    if (engaged()) ret; // what?
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    if (!mouseEventIsInBorder(e)) ret;
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    start(e);
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  }
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  public void mouseDragged(MouseEvent e) {
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    if (!engaged()) ret;
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    updatePosition(e);
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  }
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  public void mouseMoved(MouseEvent e) {
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    cursorCalc(e, true);
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  }
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  public void mouseReleased(MouseEvent e) {
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    if (mouseDownEvent == null) ret;
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    if (e.getButton() != mouseDownEvent.getButton()) ret;
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    updatePosition(e);
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    if (debug) print("drag done");
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    if (src.getCursor() == ourCursor)
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      src.setCursor(originalCursor);
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    mouseDownEvent = null;
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    dragDone();
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  }
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  void updatePosition(MouseEvent e) {
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    //if (debug) printVars("updatePosition", +e);
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    Rect w = toRect(component.getBounds());
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    Pt a = topLeftCorner(w), b = bottomRightCorner(w);
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    Pt mouse = pt(e.getXOnScreen(), e.getYOnScreen());
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    Pt minSize = toPt(component.getMinimumSize());
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    if (dragX < 0)
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      a.x = max(0, min(b.x-minSize.x, mouse.x + originalPosition.x - mouseDownEvent.getXOnScreen()));
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    else if (dragX > 0)
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      b.x = max(a.x+minSize.x, mouse.x + originalPosition.x2() - mouseDownEvent.getXOnScreen());
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    if (dragY < 0)
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      a.y = max(0, min(b.y-minSize.y, mouse.y + originalPosition.y - mouseDownEvent.getYOnScreen()));
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    else if (dragY > 0)
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      b.y = max(a.y+minSize.y, mouse.y + originalPosition.y2() - mouseDownEvent.getYOnScreen());
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    Rect r = rectFromPoints(a, b);
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    if (debug) printVars("ComponentResizeDragger.updatePosition", +w, +mouse, +a, +b, +dragX, +dragY);
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    component.setBounds(toRectangle(r));
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  }
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  void dragDone {}
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}

Author comment

Began life as a copy of #1033471

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Travelled to 4 computer(s): bhatertpkbcr, ekrmjmnbrukm, mowyntqkapby, mqqgnosmbjvj

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Snippet ID: #1035241
Snippet name: ComponentResizeDragger - resize a GUI Component with mouse
Eternal ID of this version: #1035241/10
Text MD5: 417262331dfa0257a67776fc90e62a62
Author: stefan
Category: javax / gui
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2022-05-30 16:21:26
Source code size: 4238 bytes / 132 lines
Pitched / IR pitched: No / No
Views / Downloads: 152 / 237
Version history: 9 change(s)
Referenced in: [show references]