Java Event.preventDefault方法代码示例

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void onBrowserEvent(Event event) {
    event.preventDefault();
    int eventType = event.getTypeInt();
    switch (eventType) {
        case ONMOUSEDOWN:
        case ONTOUCHSTART:
            onClick();
            break;
        case ONMOUSEUP:
            if (!singleClick) {
                onClick();
            }
            break;
        case ONMOUSEOVER:
            onMouseOver();
            break;
        case ONTOUCHEND:
        case ONMOUSEOUT:
            onMouseOut();
            break;
    }
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void onBrowserEvent(Event event) {
	switch (DOM.eventGetType(event)) {
    case Event.ONMOUSEDOWN:
    	SelectionMode mode = null; 
    	for (SelectionMode m: SelectionMode.values())
    		if (hasUnselectedDays(m)) {
    			mode = m; break;
    		}
    	if (mode != null)
    		setAllSelected(true, mode);
    	else
    		setAllSelected(false, SelectionMode.All);
    	if (iCursor != null) iPanel.getWidget().setCursor(iCursor);
    	event.preventDefault();
    	break;
	}
	super.onBrowserEvent(event);
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
/**
 * Handles special behavior of the mouse down event.
 *
 * @param event
 */
private void handleMouseDownEvent(Event event) {
	/*
	 * Prevent the keyboard focus from leaving the textfield by preventing
	 * the default behaviour of the browser. Fixes #4285.
	 */
	if (event.getTypeInt() == Event.ONMOUSEDOWN) {
		debug("VComboBoxMultiselect: blocking mouseDown event to avoid blur");

		event.preventDefault();
		event.stopPropagation();

		/*
		 * In IE the above wont work, the blur event will still trigger. So,
		 * we set a flag here to prevent the next blur event from happening.
		 * This is not needed if do not already have focus, in that case
		 * there will not be any blur event and we should not cancel the
		 * next blur.
		 */
		if (BrowserInfo.get()
			.isIE() && this.focused) {
			this.preventNextBlurEventInIE = true;
			debug("VComboBoxMultiselect: Going to prevent next blur event on IE");
		}
	}
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@UsedByApp
public void handleLinkClick(Event event) {
    Element target = Element.as(event.getEventTarget());
    String href = target.getAttribute("href");
    if (href.startsWith("send:")) {
        String msg = href.substring("send:".length());
        msg = URL.decode(msg);
        if (lastVisiblePeer != null) {
            messenger.sendMessage(lastVisiblePeer, msg);
            event.preventDefault();
        }
    } else {
        if (JsElectronApp.isElectron()) {
            JsElectronApp.openUrlExternal(href);
            event.preventDefault();
        }
    }
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void showContextMenu(Event event) {
    if (!readonly && !disabled) {
        if (!isSelected()) {
            getConnector().setContextMenuSelection(true);

            toggleSelection();
        }
        if (customContextMenu == null) {
            super.showContextMenu(event);
        } else {
            int left = event.getClientX();
            int top = event.getClientY();
            top += Window.getScrollTop();
            left += Window.getScrollLeft();

            showContextMenuPopup(left, top);

            event.stopPropagation();
            event.preventDefault();
        }
    }
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
protected void captureEvents(Event event) {
    event.preventDefault();
    if (isEnabled() && event.getButton() == Event.BUTTON_LEFT) {
        if (!dragDrop) {
            dragDrop = true;
            DOM.setCapture(resizeElement);

            ComputedStyle cs = new ComputedStyle(getElement());
            setWidth(cs.getProperty("width"));
            setHeight(cs.getProperty("height"));

            getTextArea().getStyle().setProperty("width", "100%");
            getTextArea().getStyle().setProperty("height", "100%");
        }
    }
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void onBrowserEvent(Event event) {
    if (contextMenuHandler != null && event.getTypeInt() == Event.ONCONTEXTMENU) {
        contextMenuHandler.onContextMenu(event);
        return;
    }

    if ((event.getTypeInt() == Event.ONCLICK
            || event.getTypeInt() == Event.ONMOUSEDOWN)
            && event.getButton() != NativeEvent.BUTTON_LEFT) {
        event.preventDefault();
        event.stopPropagation();
        return;
    }

    super.onBrowserEvent(event);
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void onBrowserEvent(Event event) {
	switch (DOM.eventGetType(event)) {
    case Event.ONMOUSEDOWN:
    	MouseDownEvent.fireNativeEvent(event, this);
    	event.stopPropagation();
    	event.preventDefault();
    	break;
	}
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void onBrowserEvent(Event event) {
	switch (DOM.eventGetType(event)) {
	case Event.ONKEYPRESS:
		MenuItem item = iAccessKeys.get(Character.toLowerCase((char)event.getCharCode()));
		if (item != null) {
			event.stopPropagation();
			event.preventDefault();
			item.getScheduledCommand().execute();
		}
	}
	super.onBrowserEvent(event);
	
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void onBrowserEvent(Event event) {
   	Element target = DOM.eventGetTarget(event);

    switch (DOM.eventGetType(event)) {
    case Event.ONMOUSEDOWN:
    	boolean open = iFilterOpen.getElement().equals(target);
    	boolean close = iFilterClose.getElement().equals(target);
    	boolean clear = iFilterClear.getElement().equals(target);
    	boolean filter = iFilter.getElement().equals(target);
    	if (isFilterPopupShowing() || close) {
    		hideFilterPopup();
    	} else if (open) {
    		hideSuggestions();
    		showFilterPopup();
    	}
    	if (clear) {
			iFilter.setText("");
			removeAllChips();
			setAriaLabel(toAriaString());
			ValueChangeEvent.fire(FilterBox.this, getValue());
    	}
    	if (!filter) {
			event.stopPropagation();
			event.preventDefault();
	    	Scheduler.get().scheduleDeferred(new ScheduledCommand() {
				@Override
				public void execute() {
					iFilter.setFocus(true);
				}
			});
    	}
    	break;
    }
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
private void moveWindow(Event event) {
    if (dragging) {
        if (cursorInsideBrowserContentArea(event)) {
            // Only drag while cursor is inside the browser client area
            final int x = WidgetUtil.getTouchOrMouseClientX(event) - startX
                    + origX;
            final int y = WidgetUtil.getTouchOrMouseClientY(event) - startY
                    + origY;
            setPopupPosition(x, y);
        }

        event.preventDefault();
    }
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
private void beginMovingWindow(Event event) {
    if (draggable) {
        showDraggingCurtain();
        dragging = true;
        startX = WidgetUtil.getTouchOrMouseClientX(event);
        startY = WidgetUtil.getTouchOrMouseClientY(event);
        origX = getElement().getAbsoluteLeft();
        origY = getElement().getAbsoluteTop();
        DOM.setCapture(getElement());

        event.preventDefault();
    }
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void onBrowserEvent(Event event) {
    super.onBrowserEvent(event);

    if (isEnabled() && event.getTypeInt() == Event.ONCONTEXTMENU) {
        if (getStyleName().contains("-header-sortable")) {
            _delegate.showSortMenu(td, cid);
        }

        event.preventDefault();
        event.stopPropagation();
    }
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
/**
 * Overrides the same method as per Label. Updates the CSS style on the parent
 * DIV, and then passes on control to the superclass implementation.
 *
 * @see com.google.gwt.user.client.ui.Label#onBrowserEvent(com.google.gwt.user.client.Event)
 */
@Override
public void onBrowserEvent(Event event) {

  switch (event.getTypeInt()) {
  case Event.ONMOUSEDOWN:
    me.replaceClassName(ButtonStyle.mouseUp, ButtonStyle.mouseDown);
    if (cancelMouseDownBubble) {
      event.stopPropagation();
    }
    if (preventMouseDownDefault) {
      event.preventDefault();
    }
    break;
  case Event.ONMOUSEUP:
    me.replaceClassName(ButtonStyle.mouseDown, ButtonStyle.mouseUp);
    break;
  case Event.ONMOUSEOVER:
    me.replaceClassName(ButtonStyle.mouseOut, ButtonStyle.mouseOver);
    break;
  case Event.ONMOUSEOUT:
    me.replaceClassName(ButtonStyle.mouseOver, ButtonStyle.mouseOut);
    break;
  }

  // Call to super to handle all event generation.
  super.onBrowserEvent(event);
}
 

import com.google.gwt.user.client.Event; //导入方法依赖的package包/类
@Override
public void onBrowserEvent(Event event) {
	if (Event.ONMOUSEMOVE == DOM.eventGetType(event) && !iSelection.isActive() && iMoving != null) {
		iMoving.onBrowserEvent(event);
		if (iMoving.iCursor != null)
			getElement().getStyle().setCursor(iMoving.iCursor);
		return;
	}

	double x = event.getClientX() - getAbsoluteLeft() + Window.getScrollLeft();
	double y = event.getClientY() - getAbsoluteTop() + Window.getScrollTop();

	int slot = 3 * Math.min(Math.max(0, (int)Math.round(4 * (y - 1 + iStart * iCellHeight) / iCellHeight)), 96);
	int day = Math.min(Math.max(0, (int)Math.floor((x - 2) / iCellWidth)), iDays.length - 1);
	int dayOfWeek = iDays[day];
	int weeks = (isSingleRoom() ? iSelectedWeeks.size() : iRoomResources.size());
	int week = Math.min(Math.max(0, (int)Math.floor(weeks * (x - 2 - iCellWidth * day) / (iCellWidth - 6))), weeks - 1);
	int h = slot / 12;
	int m = 5 * (slot % 12);
	String time = (CONSTANTS.useAmPm() ? (h == 0 ? "12": h <= 12 ? h : h-12) : h) + ":" + (m < 10 ? "0" : "") + m + (CONSTANTS.useAmPm() ? (h <= 11 ? "a" : "p") : "");
	
	String text = (iDayOfWeeks == null ? CONSTANTS.longDays()[dayOfWeek] : iDayOfWeeks.get(dayOfWeek)) + " " + (isSingleRoom() ? iSelectedWeeks.get(week) : iSelectedWeeks.get(0)).getDayNames().get(dayOfWeek) +
			" " + time + (isSingleRoom() ? "" : " " + iRoomResources.get(week).getName());
	ResourceInterface room = (isSingleRoom() ? iRoomResources.get(0) : iRoomResources.get(week));
	iPopup.setPopupPosition(event.getClientX() + Window.getScrollLeft(), event.getClientY() + Window.getScrollTop());
	
	getElement().getStyle().setCursor(Cursor.CROSSHAIR);
	
	switch (DOM.eventGetType(event)) {
	case Event.ONMOUSEDOWN:
		iSelection.setStart(dayOfWeek, slot, week);
		iSelection.setEnd(dayOfWeek, slot, week);
		iSelection.setVisible(true);
		iSelection.setActive(true);
		break;
	case Event.ONMOUSEMOVE:
		iSelection.setEnd(dayOfWeek, slot, week);
		if (!iPopup.isShowing()) iPopup.show();
		if (!room.getId().equals(iLastRoomId)) {
			RoomHint.showHint(iPopup.getElement(), room.getId(), "", (room.hasDistance() ? String.valueOf(Math.round(room.getDistance())) : ""), false);
			iLastRoomId = room.getId();
		}
		break;
	case Event.ONMOUSEUP:
		onMouseUp();
		break;
	case Event.ONMOUSEOVER:
		if (!iPopup.isShowing() && (iSelection.isActive() || iMoving == null)) iPopup.show();
		if (iSelection.isActive() && !iSelection.isVisible()) {
			iSelection.setVisible(true);					
		}
		if (!room.getId().equals(iLastRoomId)) {
			RoomHint.showHint(iPopup.getElement(), room.getId(), "", (room.hasDistance() ? String.valueOf(Math.round(room.getDistance())) : ""), false);
			iLastRoomId = room.getId();
		}
		break;
	case Event.ONMOUSEOUT:
		Element child = DOM.eventGetToElement(event);
		if (child != null && !getElement().isOrHasChild(child)) {
			if (iPopup.isShowing()) {
				iPopup.hide();
				RoomHint.hideHint(); iLastRoomId = null;
			}
			iSelection.setVisible(false);
		}
		/*
		if (iSelection.isActive() && !DOM.isOrHasChild(TimeGrid.this.getElement(), DOM.eventGetToElement(event))) {
			iSelection.setActive(false);
		}
		*/
		break;
	}
	
	iHint.setText((iSelection.isVisible() && iSelection.isActive() ? iSelection.toString() : text));
	
	event.preventDefault();
	event.stopPropagation();
}