Java tutorial
/* * Copyright 2000-2014 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.tabs.impl; import com.intellij.ide.IdeBundle; import com.intellij.openapi.ui.Messages; import com.intellij.ui.InplaceButton; import com.intellij.ui.MouseDragHelper; import com.intellij.ui.ScreenUtil; import com.intellij.ui.awt.RelativePoint; import com.intellij.ui.tabs.JBTabsPosition; import com.intellij.ui.tabs.TabInfo; import com.intellij.ui.util.Axis; import org.jetbrains.annotations.Nullable; import javax.swing.*; import java.awt.*; import java.awt.event.MouseEvent; class DragHelper extends MouseDragHelper { private final JBTabsImpl myTabs; private TabInfo myDragSource; private Rectangle myDragOriginalRec; Rectangle myDragRec; private Dimension myHoldDelta; private TabInfo myDragOutSource; private TabLabel myPressedTabLabel; public DragHelper(JBTabsImpl tabs) { super(tabs, tabs); myTabs = tabs; } @Override protected boolean isDragOut(MouseEvent event, Point dragToScreenPoint, Point startScreenPoint) { if (myDragSource == null || !myDragSource.canBeDraggedOut()) return false; TabLabel label = myTabs.myInfo2Label.get(myDragSource); if (label == null) return false; int dX = dragToScreenPoint.x - startScreenPoint.x; int dY = dragToScreenPoint.y - startScreenPoint.y; boolean dragOut = myTabs.getEffectiveLayout().isDragOut(label, dX, dY); return dragOut; } @Override protected void processDragOut(MouseEvent event, Point dragToScreenPoint, Point startScreenPoint, boolean justStarted) { TabInfo.DragOutDelegate delegate = myDragOutSource.getDragOutDelegate(); if (justStarted) { delegate.dragOutStarted(event, myDragOutSource); } else { delegate.processDragOut(event, myDragOutSource); } event.consume(); } @Override protected void processDragOutFinish(MouseEvent event) { super.processDragOutFinish(event); myDragOutSource.getDragOutDelegate().dragOutFinished(event, myDragOutSource); } @Override protected void processDragOutCancel() { myDragOutSource.getDragOutDelegate().dragOutCancelled(myDragOutSource); } @Override protected void processMousePressed(MouseEvent event) { // since selection change can cause tabs to be reordered, we need to remember the tab on which the mouse was pressed, otherwise // we'll end up dragging the wrong tab (IDEA-65073) myPressedTabLabel = findLabel(new RelativePoint(event).getPoint(myTabs)); } protected void processDrag(MouseEvent event, Point targetScreenPoint, Point startPointScreen) { if (!myTabs.isTabDraggingEnabled() || !isDragSource(event) || !MouseDragHelper.checkModifiers(event)) return; SwingUtilities.convertPointFromScreen(startPointScreen, myTabs); if (isDragJustStarted()) { if (myPressedTabLabel == null) return; final Rectangle labelBounds = myPressedTabLabel.getBounds(); myHoldDelta = new Dimension(startPointScreen.x - labelBounds.x, startPointScreen.y - labelBounds.y); myDragSource = myPressedTabLabel.getInfo(); myDragRec = new Rectangle(startPointScreen, labelBounds.getSize()); myDragOriginalRec = (Rectangle) myDragRec.clone(); myDragOriginalRec.x -= myHoldDelta.width; myDragOriginalRec.y -= myHoldDelta.height; } else { if (myDragRec == null) return; final Point toPoint = SwingUtilities.convertPoint(event.getComponent(), event.getPoint(), myTabs); myDragRec.x = toPoint.x; myDragRec.y = toPoint.y; } myDragRec.x -= myHoldDelta.width; myDragRec.y -= myHoldDelta.height; final Rectangle headerRec = myTabs.getLastLayoutPass().getHeaderRectangle(); ScreenUtil.moveToFit(myDragRec, headerRec, null); int deadZoneX = 0; int deadZoneY = 0; final TabLabel top = findLabel(new Point(myDragRec.x + myDragRec.width / 2, myDragRec.y + deadZoneY)); final TabLabel bottom = findLabel( new Point(myDragRec.x + myDragRec.width / 2, myDragRec.y + myDragRec.height - deadZoneY)); final TabLabel left = findLabel(new Point(myDragRec.x + deadZoneX, myDragRec.y + myDragRec.height / 2)); final TabLabel right = findLabel( new Point(myDragRec.x + myDragRec.width - deadZoneX, myDragRec.y + myDragRec.height / 2)); TabLabel targetLabel; if (myTabs.isHorizontalTabs()) { targetLabel = findMostOverlapping(Axis.X, left, right); if (targetLabel == null) { targetLabel = findMostOverlapping(Axis.Y, top, bottom); } } else { targetLabel = findMostOverlapping(Axis.Y, top, bottom); if (targetLabel == null) { targetLabel = findMostOverlapping(Axis.X, left, right); } } if (targetLabel != null) { Rectangle saved = myDragRec; myDragRec = null; myTabs.reallocate(myDragSource, targetLabel.getInfo()); myDragOriginalRec = myTabs.myInfo2Label.get(myDragSource).getBounds(); myDragRec = saved; myTabs.moveDraggedTabLabel(); } else { myTabs.moveDraggedTabLabel(); final int border = myTabs.getTabsBorder().getTabBorderSize(); headerRec.x -= border; headerRec.y -= border; headerRec.width += border * 2; headerRec.height += border * 2; myTabs.repaint(headerRec); } event.consume(); } private boolean isDragSource(MouseEvent event) { final Object source = event.getSource(); if (source instanceof Component) { return SwingUtilities.windowForComponent(myTabs) == SwingUtilities .windowForComponent((Component) source); } return false; } private TabLabel findMostOverlapping(Axis measurer, TabLabel... labels) { double freeSpace; if (measurer.getMinValue(myDragRec) < measurer.getMinValue(myDragOriginalRec)) { freeSpace = measurer.getMaxValue(myDragOriginalRec) - measurer.getMaxValue(myDragRec); } else { freeSpace = measurer.getMinValue(myDragRec) - measurer.getMinValue(myDragOriginalRec); } int max = -1; TabLabel maxLabel = null; for (TabLabel each : labels) { if (each == null) continue; final Rectangle eachBounds = each.getBounds(); if (measurer.getSize(eachBounds) > freeSpace + freeSpace * 0.3) continue; Rectangle intersection = myDragRec.intersection(eachBounds); int size = intersection.width * intersection.height; if (size > max) { max = size; maxLabel = each; } } return maxLabel; } @Nullable private TabLabel findLabel(Point dragPoint) { final Component at = myTabs.findComponentAt(dragPoint); if (at instanceof InplaceButton) return null; final TabLabel label = findLabel(at); return label != null && label.getParent() == myTabs && label.getInfo() != myDragSource ? label : null; } @Nullable private TabLabel findLabel(Component c) { Component eachParent = c; while (eachParent != null && eachParent != myTabs) { if (eachParent instanceof TabLabel) return (TabLabel) eachParent; eachParent = eachParent.getParent(); } return null; } @Override protected boolean canStartDragging(JComponent dragComponent, Point dragComponentPoint) { return findLabel(dragComponentPoint) != null; } @Override protected void processDragFinish(MouseEvent event, boolean willDragOutStart) { super.processDragFinish(event, willDragOutStart); endDrag(willDragOutStart); final JBTabsPosition position = myTabs.getTabsPosition(); if (!willDragOutStart && myTabs.isAlphabeticalMode() && position != JBTabsPosition.top && position != JBTabsPosition.bottom) { Point p = new Point(event.getPoint()); p = SwingUtilities.convertPoint(event.getComponent(), p, myTabs); if (myTabs.getVisibleRect().contains(p) && myPressedOnScreenPoint.distance(new RelativePoint(event).getScreenPoint()) > 15) { final int answer = Messages.showOkCancelDialog(myTabs, IdeBundle.message("alphabetical.mode.is.on.warning"), IdeBundle.message("title.warning"), Messages.getQuestionIcon()); if (answer == Messages.OK) { JBEditorTabs.setAlphabeticalMode(false); myTabs.relayout(true, false); myTabs.revalidate(); } } } } private void endDrag(boolean willDragOutStart) { if (willDragOutStart) { myDragOutSource = myDragSource; } myDragSource = null; myDragRec = null; myTabs.resetTabsCache(); if (!willDragOutStart) { myTabs.fireTabsMoved(); } myTabs.relayout(true, false); myTabs.revalidate(); } @Override protected void processDragCancel() { endDrag(false); } public TabInfo getDragSource() { return myDragSource; } }