JBCardLayout, CardLayout able to swipe pages

diff --git a/platform/platform-impl/src/com/intellij/ui/JBCardLayout.java b/platform/platform-impl/src/com/intellij/ui/JBCardLayout.java
new file mode 100644 (file)
index 0000000..ae3aafa
--- /dev/null
+++ b/platform/platform-impl/src/com/intellij/ui/JBCardLayout.java
@@ -0,0 +1,232 @@
+/*
+ * Copyright 2000-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.ui;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * User: Vassiliy.Kudryashov
+ */
+public class JBCardLayout extends CardLayout {
+  public enum SwipeDirection {FORWARD, BACKWARD, AUTO}
+
+  private Map<String, Component> myMap = new LinkedHashMap<String, Component>();
+  private int mySwipeTime = 400;//default value, provide setter if need
+  private int mySwipeSteps = 20;//default value, provide setter if need
+  private final Timer myTimer = new Timer(Math.max(1, mySwipeTime / mySwipeSteps), null);
+  private Component mySwipeFrom = null;
+  private Component mySwipeTo = null;
+
+  public JBCardLayout() {
+    this(0, 0);
+  }
+
+  public JBCardLayout(int hgap, int vgap) {
+    super(hgap, vgap);
+  }
+
+  @Override
+  public void addLayoutComponent(String name, Component comp) {
+    super.addLayoutComponent(name, comp);
+    myMap.put(name, comp);
+  }
+
+  @Override
+  public void removeLayoutComponent(Component comp) {
+    stopSwipeIfNeed();
+    super.removeLayoutComponent(comp);
+    for (Iterator<Map.Entry<String, Component>> iterator = myMap.entrySet().iterator(); iterator.hasNext(); ) {
+      Map.Entry<String, Component> entry = iterator.next();
+      if (entry.getValue() == comp) {
+        iterator.remove();
+        break;
+      }
+    }
+  }
+
+  @Override
+  public void layoutContainer(Container parent) {
+    if (!myTimer.isRunning()) {
+      super.layoutContainer(parent);
+    }
+  }
+
+  public void swipe(@NotNull final Container parent, @NotNull final String name, @NotNull SwipeDirection direction) {
+    stopSwipeIfNeed();
+    mySwipeFrom = findVisible(parent);
+    mySwipeTo = myMap.get(name);
+    if (mySwipeFrom == null || mySwipeTo == null || mySwipeFrom == mySwipeTo) {
+      return;
+    }
+    final boolean isForward;
+    if (direction == SwipeDirection.AUTO) {
+      boolean b = true;
+      for (Component component : myMap.values()) {
+        if (component == mySwipeFrom || component == mySwipeTo) {
+          b = component == mySwipeFrom;
+          break;
+        }
+      }
+      isForward = b;
+    }
+    else {
+      isForward = direction == SwipeDirection.FORWARD;
+    }
+    final double[] linearProgress = new double[1];
+    linearProgress[0] = 0;
+    final long startTime = System.currentTimeMillis();
+    ActionListener listener = new ActionListener() {
+      @Override
+      public void actionPerformed(ActionEvent e) {
+        long timePassed = System.currentTimeMillis() - startTime;
+        if (timePassed >= mySwipeTime) {
+          show(parent, name);
+          return;
+        }
+        linearProgress[0] = Math.min(1, Math.max(0, (float)timePassed / mySwipeTime));
+        double naturalProgress = (1 - Math.cos(Math.PI * linearProgress[0])) / 2;
+        Rectangle bounds = parent.getBounds();
+        bounds.setLocation(0, 0);
+        Rectangle r = new Rectangle(bounds);
+        int x = (int)((naturalProgress * r.width));
+        r.translate(isForward ? -x : x, 0);
+        mySwipeFrom.setBounds(r);
+        Rectangle r2 = new Rectangle(bounds);
+        r2.translate(isForward ? r2.width - x : x - r2.width, 0);
+        mySwipeTo.setVisible(true);
+        mySwipeTo.setBounds(r2);
+        parent.repaint();
+      }
+    };
+    for (ActionListener actionListener : myTimer.getActionListeners()) {
+      myTimer.removeActionListener(actionListener);
+    }
+    myTimer.addActionListener(listener);
+    myTimer.start();
+  }
+
+  private void stopSwipeIfNeed() {
+    if (myTimer.isRunning()) {
+      myTimer.stop();
+      mySwipeFrom = null;
+      if (mySwipeTo != null) {
+        mySwipeTo.setVisible(false);
+        mySwipeTo = null;
+      }
+    }
+  }
+
+  @Nullable
+  private static Component findVisible(Container parent) {
+    for (int i = 0; i < parent.getComponentCount(); i++) {
+      Component component = parent.getComponent(i);
+      if (component.isVisible()) return component;
+    }
+    return null;
+  }
+
+  @Override
+  public void first(Container parent) {
+    stopSwipeIfNeed();
+    super.first(parent);
+  }
+
+  @Override
+  public void next(Container parent) {
+    stopSwipeIfNeed();
+    super.next(parent);
+  }
+
+  @Override
+  public void previous(Container parent) {
+    stopSwipeIfNeed();
+    super.previous(parent);
+  }
+
+  @Override
+  public void last(Container parent) {
+    stopSwipeIfNeed();
+    super.last(parent);
+  }
+
+  @Override
+  public void show(Container parent, String name) {
+    stopSwipeIfNeed();
+    super.show(parent, name);
+  }
+
+  public static void main(String[] args) throws IOException {
+    final JBCardLayout cardLayout = new JBCardLayout();
+
+    JFrame f = new JFrame();
+    JPanel p = new JPanel(new BorderLayout());
+    final JPanel centerPanel = new JPanel(cardLayout);
+    for (int i = 0; i < 10; i++) {
+      JLabel l = new JLabel("Page #" + (i + 1), SwingConstants.CENTER);
+      l.setOpaque(true);
+      int red = 50 + (int)(Math.random() * 100);
+      int green = 50 + (int)(Math.random() * 100);
+      int blue = 50 + (int)(Math.random() * 100);
+      l.setForeground(new Color(red, green, blue));
+      red = 255 - (int)(Math.random() * 55);
+      green = 255 - (int)(Math.random() * 55);
+      blue = 255 - (int)(Math.random() * 55);
+      l.setBackground(new Color(red, green, blue));
+      l.setFont(l.getFont().deriveFont(40F));
+      centerPanel.add(l, "page" + i);
+    }
+    final int[] cursor = new int[1];
+    JButton prevButton = new JButton("<<");
+    JButton nextButton = new JButton(">>");
+    prevButton.addActionListener(new ActionListener() {
+      @Override
+      public void actionPerformed(ActionEvent e) {
+        cursor[0]--;
+        if (cursor[0] < 0) {
+          cursor[0] = 9;
+        }
+        cardLayout.swipe(centerPanel, "page" + cursor[0], SwipeDirection.BACKWARD);
+      }
+    });
+    nextButton.addActionListener(new ActionListener() {
+      @Override
+      public void actionPerformed(ActionEvent e) {
+        cursor[0] = (cursor[0] + 1) % 10;
+        cardLayout.swipe(centerPanel, "page" + cursor[0], SwipeDirection.FORWARD);
+      }
+    });
+
+    p.setLayout(new BorderLayout());
+    p.add(prevButton, BorderLayout.WEST);
+    p.add(centerPanel, BorderLayout.CENTER);
+    p.add(nextButton, BorderLayout.EAST);
+    f.setContentPane(p);
+    f.setSize(new Dimension(600, 800));
+    f.setLocationRelativeTo(null);
+    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+    f.setVisible(true);
+  }
+}