litesoft
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// This Source Code is derived from the version(s) at litesoft.org which are in the Public Domain per: http://unlicense.org package com.wdstechnology.ucci.deviceassist.client.ui; import com.google.gwt.event.dom.client.MouseMoveEvent; import com.google.gwt.user.client.*; public class WidgetMouseHandler { public interface MouseClickedListener { void mouseClicked(); } public interface Logger { void log(String message); } public static int EVENT_BITS = Event.MOUSEEVENTS; private static final State sREGULAR = new State("Regular"); private static final State sMOUSEOVER = new State("Mouseover"); private static final State sMOUSEDOWN = new State("Mousedown"); private static final State sDISABLED = new State("Disabled"); public static final State[] ALL_STATES = new State[] { sREGULAR, sMOUSEOVER, sMOUSEDOWN, sDISABLED }; private boolean mMouseOver = false; private boolean mMouseDown = false; private boolean mDisabled = false; protected Element mMouseCtrlElement; private MouseClickedListener mListener; protected State mCurrentState = null; private Element mSavedCaptureElement = null; private final Logger mLogger; private boolean mLastLogWasMove = false; public WidgetMouseHandler(Element pMouseCtrlElement, MouseClickedListener pListener, Logger pLogger) { mMouseCtrlElement = pMouseCtrlElement; mListener = pListener; mLogger = (pLogger != null) ? pLogger : NOOP_LOGGER; } private State determineNewForm() { if (mDisabled) { return sDISABLED; } if (mMouseDown) { return sMOUSEDOWN; } if (mMouseOver) { return sMOUSEOVER; } return sREGULAR; } public WidgetMouseHandler updateForm() { State zNewForm = determineNewForm(); if (mCurrentState != zNewForm) { if (mCurrentState != null) { removeCurrentState(); if (mCurrentState == sMOUSEDOWN) { DOM.releaseCapture(mMouseCtrlElement); if (mSavedCaptureElement != null) { DOM.setCapture(mSavedCaptureElement); mSavedCaptureElement = null; } } } if (zNewForm != sDISABLED) { if (zNewForm == sMOUSEDOWN) { mSavedCaptureElement = DOM.getCaptureElement(); if (mSavedCaptureElement != null) { DOM.releaseCapture(mSavedCaptureElement); } DOM.setCapture(mMouseCtrlElement); } } mCurrentState = zNewForm; applyCurrentState(); } return this; } protected void applyCurrentState() { mMouseCtrlElement.addClassName("" + mCurrentState); } protected void removeCurrentState() { mMouseCtrlElement.removeClassName("" + mCurrentState); } public boolean isEnabled() { return !mDisabled; } public void setEnabled(boolean pEnabled) { mDisabled = !pEnabled; updateForm(); } public boolean onBrowserEvent(Event pEvent) { switch (DOM.eventGetType(pEvent)) { case Event.ONMOUSEDOWN: eventPreventDefaultAndCancelBubble(pEvent); onMouseDown(pEvent); break; case Event.ONMOUSEUP: onMouseUp(pEvent); break; case Event.ONMOUSEOVER: onMouseEnter(pEvent); break; case Event.ONMOUSEOUT: onMouseLeave(pEvent); break; case Event.ONMOUSEMOVE: eventPreventDefaultAndCancelBubble(pEvent); onMouseMove(pEvent); default: return false; } return !isEnabled(); } protected void onMouseDown(Event pEvent) { mouseDown(); } protected void onMouseUp(Event pEvent) { mouseUp(); } protected void onMouseEnter(Event pEvent) { mouseEnter(); } protected void onMouseLeave(Event pEvent) { mouseLeave(); } protected void onMouseMove(Event pEvent) { if (!mLastLogWasMove) { mLastLogWasMove = true; mLogger.log("Move"); } MyMouseMoveEvent zEvent = new MyMouseMoveEvent(pEvent); int zRelativeX = zEvent.getRelativeX(mMouseCtrlElement); int zOffsetWidth = mMouseCtrlElement.getOffsetWidth(); int zRelativeY = zEvent.getRelativeY(mMouseCtrlElement); int zOffsetHeight = mMouseCtrlElement.getOffsetHeight(); if (over(zRelativeX, zOffsetWidth) && over(zRelativeY, zOffsetHeight)) { if (!mMouseOver) { mouseEnter(); } } else { if (mMouseOver) { mouseLeave(); } } } private boolean over(int pRelativeAt, int pOffsetSize) { return (0 <= pRelativeAt) && (pRelativeAt < pOffsetSize); } protected void mouseDown() { mLastLogWasMove = false; mLogger.log("Down"); mMouseDown = true; updateForm(); } protected void mouseUp() { mLastLogWasMove = false; mLogger.log("Up"); mMouseDown = false; updateForm(); if (mListener != null) { mListener.mouseClicked(); } } protected void mouseEnter() { mLastLogWasMove = false; mLogger.log("Enter"); mMouseOver = true; updateForm(); } protected void mouseLeave() { mLastLogWasMove = false; mLogger.log("Leave"); mMouseDown = false; mMouseOver = false; updateForm(); } public static void eventPreventDefaultAndCancelBubble(Event pEvent) { pEvent.preventDefault(); pEvent.stopPropagation(); } public static class State { private String mText; public State(String pText) { mText = pText; } @Override public String toString() { return mText; } public String getURL(String pURLBaseGifExtentionAssumed) { return pURLBaseGifExtentionAssumed + "-" + mText + ".cache.gif"; } } protected static class MyMouseMoveEvent extends MouseMoveEvent { public MyMouseMoveEvent(Event pEvent) { setNativeEvent(pEvent); } } private static final Logger NOOP_LOGGER = new Logger() { public void log(String message) { } }; } |