projects / deliverable / tracecompass.git / blame
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1 | /******************************************************************************* |
| 2 | * Copyright (c) 2009, 2010 Ericsson | |
| 3 | * | |
| 4 | * All rights reserved. This program and the accompanying materials are | |
| 5 | * made available under the terms of the Eclipse Public License v1.0 which | |
| 6 | * accompanies this distribution, and is available at | |
| 7 | * http://www.eclipse.org/legal/epl-v10.html | |
| 8 | * | |
| 9 | * Contributors: | |
| 10 | * 2010-06-20 Yuriy Vashchuk - Initial API and implementation | |
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11 | * |
| 12 | * Modifications: | |
| 13 | * 2010-07-16 Yuriy Vashchuk - Base class simplification. | |
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14 | *******************************************************************************/ |
| 15 | ||
| 16 | package org.eclipse.linuxtools.lttng.ui.views.histogram; | |
| 17 | ||
| 18 | import org.eclipse.swt.events.ControlEvent; | |
| 19 | ||
| 20 | /** | |
| 21 | * <b><u>ParentHistogramCanvasControlListener</u></b> | |
| 22 | * <p> | |
| 23 | * Implementation of a ControlListener for the need of the ParentHistogramCanvas | |
| 24 | * <p> | |
| 25 | */ | |
| 26 | public class ParentHistogramCanvasControlListener extends HistogramCanvasControlListener { | |
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27 | |
| 28 | private ParentHistogramCanvas ourCanvas = null; | |
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29 | |
| 30 | /** | |
| 31 | * ParentHistogramCanvasControlListenerl constructor | |
| 32 | * | |
| 33 | * @param newCanvas Related canvas | |
| 34 | */ | |
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35 | public ParentHistogramCanvasControlListener(ParentHistogramCanvas newCanvas) { |
| 36 | ourCanvas = newCanvas; | |
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37 | } |
| 38 | ||
| 39 | ||
| 40 | /** | |
| 41 | * Method called when the canvas is resized.<p> | |
| 42 | * | |
| 43 | * We need to tell the content that the canvas size changed and to recenter the windows | |
| 44 | * | |
| 45 | * @param event The control event generated by the resize. | |
| 46 | */ | |
| 47 | @Override | |
| 48 | public void controlResized(ControlEvent event) { | |
| 49 | ||
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50 | if ( (ourCanvas != null) && (ourCanvas.getHistogramContent() != null) ) { |
| 51 | int newSize = ourCanvas.getSize().x; | |
| 52 | int oldSize = ourCanvas.getHistogramContent().getCanvasWindowSize(); | |
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53 | |
| 54 | // Set the new canvas size | |
| f05aabed | 55 | ourCanvas.getHistogramContent().setCanvasWindowSize(newSize); |
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56 | |
| 57 | // Try to recenter to window at the same place it was | |
| 58 | // Note : this is a best hope approach and is not intended to be precise; | |
| 59 | // the idea is to avoid issuing a (maybe) long request fo the selection window; | |
| 60 | // There WILL be slight discrepancy between the "window values" (timestamp, etc...) showed | |
| 61 | // and what it really points to. The user should reclick by himself to refresh it. | |
| f05aabed | 62 | int oldWindowCenter = ourCanvas.getCurrentWindow().getWindowXPositionCenter(); |
| 3e9fdb8b | 63 | int newWindowCenter = (int)Math.ceil((double)newSize * ((double)oldWindowCenter / (double)oldSize)); |
| f05aabed | 64 | ourCanvas.setWindowCenterPosition(newWindowCenter); |
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65 | } |
| 66 | } | |
| 67 | } |