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/*
 * Copyright 2011 ArcBees Inc.
 *
 * 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.gwtplatform.mvp.client;

import com.gwtplatform.mvp.client.view.PopupPositioner;

/**
 * The interface for {@link View} classes that is meant to be displayed as a
 * popup, like a GWT {@link com.google.gwt.user.client.ui.PopupPanel} or a
 * {@link com.google.gwt.user.client.ui.DialogBox}.
 */
public interface PopupView extends View {
    /**
     * Make sure the {@link PopupView} is hidden. You can call this method
     * directly.
     */
    void hide();

    /**
     * Indicates that the view should automatically hide when a GWTP
     * {@link com.gwtplatform.mvp.client.proxy.NavigationEvent} is fired. This is
     * better than using GWT's
     * {@link com.google.gwt.user.client.ui.PopupPanel#setAutoHideOnHistoryEventsEnabled(boolean)}
     * since the latter will automatically hide the dialog even if navigation is
     * refused through
     * {@link com.gwtplatform.mvp.client.proxy.PlaceManager#setOnLeaveConfirmation(String)}
     * .
     */
    void setAutoHideOnNavigationEventEnabled(boolean autoHide);

    /**
     * Identifies which {@link PopupViewCloseHandler} should be called when this
     * view closed (either automatically or through a call to {@link #hide()}.
     *
     * @param popupViewCloseHandler The {@link PopupViewCloseHandler} or
     *                              {@code null} to unregister any handlers.
     */
    void setCloseHandler(PopupViewCloseHandler popupViewCloseHandler);

    /**
     * Important! Do not call this directly, instead use
     * {@link PresenterWidget#addToPopupSlot(PresenterWidget)} passing this
     * view's {@link PresenterWidget}.
     * 
     * Make sure the {@link PopupView} is visible.
     * Will not reposition the popup before showing it.
     */
    void show();

    /**
     * You don't need to call this directly it is automatically
     * called during onReveal().
     * Will position the popup before showing it.
     */
    void showAndReposition();

    /**
     * Set the PopupPositioner which will position this popup when it's presenter is revealed.
     * @param positioner The {@link PopupPositioner} will automatically position the popup onReveal();
     * @see
     * {@link com.gwtplatform.mvp.client.view.CenterPopupPositioner},
     * {@link com.gwtplatform.mvp.client.view.RelativeToWidgetPopupPositioner},
     * {@link com.gwtplatform.mvp.client.view.TopLeftPopupPositioner}
     */
    void setPopupPositioner(PopupPositioner popupPositioner);

    /**
     * Reposition the {@link PopupView} within the browser's client area. This
     * method should not change the view visibility: if it was hidden (resp.
     * visible) it remains hidden (resp. visible).
     *
     * @param left The left position of the top-left corner (in pixels).
     * @param top  The top position of the top-left corner (in pixels).
     * @deprecated since 1.4. Use a {@link com.gwtplatform.mvp.client.view.PopupPositioner} instead.
     */
    @Deprecated
    void setPosition(int left, int top);

    /**
     * This method does nothing.
     * @deprecated since 1.4. Use a {@link com.gwtplatform.mvp.client.view.PopupPositioner} instead.
     */
    @Deprecated
    void center();
}