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PODrawing a selection box using Swing
 

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    <p>I have written an application with a panel and three buttons. I want to add selection this buttons using the mouse. I mean like we have in Windows on the Desktop. I press the left mouse button and with the movement of the mouse the area selection is growing. </p> <p>Is there a specific interface in this or do I have it manually call the appropriate methods for event listeners and there draw transparent rectangle? Here is a picture:</p> <p><img src="https://i.stack.imgur.com/CItpD.jpg" alt="Example Screenshot"></p> <p>So I have a problem when I paint rectangle using event mouse-dragged, button is repainting so user see blinking button. I want to this button don't disapear when I paint rectangle. I think that I need to use glassPane. This is my conception. I have a frame. In frame I add panel with button and I need another panel where I will paint transparent rectangle. I am thinking then my button will not be still repainting. What do you think about this conception. Or maybe someone have another idea. This is code:</p> <pre><code> @Override public void mousePressed(MouseEvent e) { startPoint=e.getPoint(); setOpaque(true); Graphics2D g2 = (Graphics2D)getGraphics(); Rectangle2D prostokat = new Rectangle2D.Double(); prostokat.setFrameFromDiagonal(e.getPoint().x, e.getPoint().y,startPoint.x, startPoint.y); g2.setComposite(AlphaComposite.getInstance(rule, alpha)); g2.draw(prostokat); g2.setColor(Color.BLUE); g2.fill(prostokat); } @Override public void mouseDragged(MouseEvent e) { setOpaque(true); Graphics2D g2 = (Graphics2D)getGraphics(); Rectangle2D prostokat = new Rectangle2D.Double(); prostokat.setFrameFromDiagonal(e.getPoint().x, e.getPoint().y,startPoint.x, startPoint.y); g2.setComposite(AlphaComposite.getInstance(rule, alpha)); g2.draw(prostokat); g2.setColor(Color.BLUE); g2.fill(prostokat); paintComponent(g2); } int rule = AlphaComposite.SRC_OVER; float alpha = 0.85F; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { zaznacz rys = new zaznacz(); JFrame frame = new JFrame(); JButton Button = new JButton("1"); JPanel panel = new JPanel(); panel.add(Button); rys.add(panel); frame.setSize(400,300); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); panel.setOpaque(false); frame.add(rys); } }); } } </code></pre> <p>I know that code is no perfect but almost work. I have a little problem. When I press the mousebutton and dragging my button disapear. <img src="https://i.stack.imgur.com/Ppmb3.jpg" alt="enter image description here"> <img src="https://i.stack.imgur.com/Y9teM.jpg" alt="enter image description here"></p> <p>I don't need advise like "your code is wrong". I know that and I want to somebody help me what I must correct. I know that I shouldn't use paintComponent() in mouseEvents but only that way I can paint transparent rectangle. Or maybe you can othet idea how I can draw transparent rectangle. I try and try and I think that i must change mouseDragged method. because when I delete code from this method and only draw rectangle over a button all is ok. But problem is when I need draw rectangle by dragging mouse. I should change paint but I don't have idea how. Anyone can help me or try help me?</p>
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    1. COStating your problem clearly would help. And reduce the code you post to the minimum you need to show what you want to show. Pasting a complete program here isn't too nice as most people don't particularly want to read through a wall of code before even knowing what you did.
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    2. COI pasted complete program here, because I think that when people paste and execute program on their computers then see clearly what I mean.
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    3. COYou're asking quite a bit from those who might want to help you. I rarely run code provided on SO and many others don't, too. People don't have infinite time and you can greatly reduce their effort with a well-written question. Currently it looks too much like »Here is what I want, here is what I've written. Now fix my code for me.« Most people will not do that.
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