chrome/android/java/src/org/chromium/chrome/browser/modaldialog/ChromeTabModalPresenter.java - chromium/src - Git at Google

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 package org.chromium.chrome.browser.modaldialog;

 import android.content.res.Resources;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewGroup.MarginLayoutParams;
 import android.view.ViewStub;

 import androidx.annotation.VisibleForTesting;

 import org.chromium.base.supplier.Supplier;
 import org.chromium.cc.input.BrowserControlsState;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.app.ChromeActivity;
 import org.chromium.chrome.browser.browser_controls.BrowserControlsStateProvider;
 import org.chromium.chrome.browser.browser_controls.BrowserControlsUtils;
 import org.chromium.chrome.browser.browser_controls.BrowserControlsVisibilityManager;
 import org.chromium.chrome.browser.compositor.bottombar.OverlayPanel;
 import org.chromium.chrome.browser.contextualsearch.ContextualSearchManager;
 import org.chromium.chrome.browser.fullscreen.FullscreenManager;
 import org.chromium.chrome.browser.omnibox.OmniboxFocusReason;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabAttributeKeys;
 import org.chromium.chrome.browser.tab.TabAttributes;
 import org.chromium.chrome.browser.tab.TabBrowserControlsConstraintsHelper;
 import org.chromium.chrome.browser.ui.TabObscuringHandler;
 import org.chromium.components.browser_ui.modaldialog.TabModalPresenter;
 import org.chromium.components.browser_ui.util.BrowserControlsVisibilityDelegate;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.ui.UiUtils;
 import org.chromium.ui.modelutil.PropertyModel;
 import org.chromium.ui.util.TokenHolder;

 /**
  * This presenter creates tab modality by blocking interaction with select UI elements while a
  * dialog is visible.
  */
 public class ChromeTabModalPresenter
         extends TabModalPresenter implements BrowserControlsStateProvider.Observer {
     /** The activity displaying the dialogs. */
     private final ChromeActivity mChromeActivity;
     private final Supplier<TabObscuringHandler> mTabObscuringHandlerSupplier;
     private final FullscreenManager mFullscreenManager;
     private final BrowserControlsVisibilityManager mBrowserControlsVisibilityManager;
     private final TabModalBrowserControlsVisibilityDelegate mVisibilityDelegate;

     /** The active tab of which the dialog will be shown on top. */
     private Tab mActiveTab;

     /** The parent view that contains the dialog container. */
     private ViewGroup mContainerParent;

     /** Whether the dialog container is brought to the front in its parent. */
     private boolean mContainerIsAtFront;

     /**
      * Whether an enter animation on the dialog container should run when
      * {@link #onBrowserControlsFullyVisible} is called.
      */
     private boolean mRunEnterAnimationOnCallback;

     /**
      * The sibling view of the dialog container drawn next in its parent when it should be behind
      * browser controls. If BottomSheet is opened or UrlBar is focused, the dialog container should
      * be behind the browser controls and the URL suggestions.
      */
     private View mDefaultNextSiblingView;

     private int mBottomControlsHeight;
     private boolean mShouldUpdateContainerLayoutParams;

     /** A token held while the dialog manager is obscuring all tabs. */
     private int mTabObscuringToken;

     /**
      * Constructor for initializing dialog container.
      * @param chromeActivity The activity displaying the dialogs.
      * @param tabObscuringHandler TabObscuringHandler object.
      */
     public ChromeTabModalPresenter(
             ChromeActivity chromeActivity, Supplier<TabObscuringHandler> tabObscuringHandler) {
         super(chromeActivity);
         mChromeActivity = chromeActivity;
         mTabObscuringHandlerSupplier = tabObscuringHandler;
         mFullscreenManager = mChromeActivity.getFullscreenManager();
         mBrowserControlsVisibilityManager = mChromeActivity.getBrowserControlsManager();
         mBrowserControlsVisibilityManager.addObserver(this);
         mVisibilityDelegate = new TabModalBrowserControlsVisibilityDelegate();
         mTabObscuringToken = TokenHolder.INVALID_TOKEN;
     }

     public void destroy() {
         mBrowserControlsVisibilityManager.removeObserver(this);
     }

     /**
      * @return The browser controls visibility delegate associated with tab modal dialogs.
      */
     public BrowserControlsVisibilityDelegate getBrowserControlsVisibilityDelegate() {
         return mVisibilityDelegate;
     }

     @Override
     protected ViewGroup createDialogContainer() {
         ViewStub dialogContainerStub =
                 mChromeActivity.findViewById(R.id.tab_modal_dialog_container_stub);
         dialogContainerStub.setLayoutResource(R.layout.modal_dialog_container);

         ViewGroup dialogContainer = (ViewGroup) dialogContainerStub.inflate();
         dialogContainer.setVisibility(View.GONE);

         // Make sure clicks are not consumed by content beneath the container view.
         dialogContainer.setClickable(true);

         mContainerParent = (ViewGroup) dialogContainer.getParent();
         // The default sibling view is the next view of the dialog container stub in main.xml and
         // should not be removed from its parent.
         mDefaultNextSiblingView =
                 mChromeActivity.findViewById(R.id.tab_modal_dialog_container_sibling_view);
         assert mDefaultNextSiblingView != null;

         Resources resources = mChromeActivity.getResources();

         MarginLayoutParams params = (MarginLayoutParams) dialogContainer.getLayoutParams();
         params.width = ViewGroup.MarginLayoutParams.MATCH_PARENT;
         params.height = ViewGroup.MarginLayoutParams.MATCH_PARENT;
         params.topMargin = getContainerTopMargin(resources, mBrowserControlsVisibilityManager);
         params.bottomMargin = getContainerBottomMargin(mBrowserControlsVisibilityManager);
         dialogContainer.setLayoutParams(params);

         int scrimVerticalMargin =
                 resources.getDimensionPixelSize(R.dimen.tab_modal_scrim_vertical_margin);
         View scrimView = dialogContainer.findViewById(R.id.scrim);
         params = (MarginLayoutParams) scrimView.getLayoutParams();
         params.width = MarginLayoutParams.MATCH_PARENT;
         params.height = MarginLayoutParams.MATCH_PARENT;
         params.topMargin = scrimVerticalMargin;
         scrimView.setLayoutParams(params);

         return dialogContainer;
     }

     @Override
     protected void showDialogContainer() {
         if (mShouldUpdateContainerLayoutParams) {
             MarginLayoutParams params = (MarginLayoutParams) getDialogContainer().getLayoutParams();
             params.topMargin = getContainerTopMargin(
                     mChromeActivity.getResources(), mBrowserControlsVisibilityManager);
             params.bottomMargin = mBottomControlsHeight;
             getDialogContainer().setLayoutParams(params);
             mShouldUpdateContainerLayoutParams = false;
         }

         // Don't show the dialog container before browser controls are guaranteed fully visible.
         if (BrowserControlsUtils.areBrowserControlsFullyVisible(
                     mBrowserControlsVisibilityManager)) {
             runEnterAnimation();
         } else {
             mRunEnterAnimationOnCallback = true;
         }
         assert mTabObscuringToken == TokenHolder.INVALID_TOKEN;
         mTabObscuringToken = mTabObscuringHandlerSupplier.get().obscureAllTabs();
     }

     @Override
     protected void setBrowserControlsAccess(boolean restricted) {
         if (mChromeActivity.getToolbarManager() == null) return;

         View menuButton = mChromeActivity.getToolbarManager().getMenuButtonView();

         if (restricted) {
             mActiveTab = mChromeActivity.getActivityTab();
             assert mActiveTab
                     != null : "Tab modal dialogs should be shown on top of an active tab.";

             // Hide contextual search panel so that bottom toolbar will not be
             // obscured and back press is not overridden.
             ContextualSearchManager contextualSearchManager =
                     mChromeActivity.getContextualSearchManager();
             if (contextualSearchManager != null) {
                 contextualSearchManager.hideContextualSearch(
                         OverlayPanel.StateChangeReason.UNKNOWN);
             }

             // Dismiss the action bar that obscures the dialogs but preserve the text selection.
             WebContents webContents = mActiveTab.getWebContents();
             if (webContents != null) {
                 saveOrRestoreTextSelection(webContents, true);
             }

             // Force toolbar to show and disable overflow menu.
             onTabModalDialogStateChanged(true);

             mChromeActivity.getToolbarManager().setUrlBarFocus(false, OmniboxFocusReason.UNFOCUS);

             menuButton.setEnabled(false);
         } else {
             // Show the action bar back if it was dismissed when the dialogs were showing.
             WebContents webContents = mActiveTab.getWebContents();
             if (webContents != null) {
                 saveOrRestoreTextSelection(webContents, false);
             }

             onTabModalDialogStateChanged(false);
             menuButton.setEnabled(true);
             mActiveTab = null;
         }
     }

     @Override
     protected void removeDialogView(PropertyModel model) {
         mRunEnterAnimationOnCallback = false;
         mTabObscuringHandlerSupplier.get().unobscureAllTabs(mTabObscuringToken);
         mTabObscuringToken = TokenHolder.INVALID_TOKEN;
         super.removeDialogView(model);
     }

     @Override
     public void onControlsOffsetChanged(int topOffset, int topControlsMinHeightOffset,
             int bottomOffset, int bottomControlsMinHeightOffset, boolean needsAnimate) {
         if (getDialogModel() == null || !mRunEnterAnimationOnCallback
                 || !BrowserControlsUtils.areBrowserControlsFullyVisible(
                         mBrowserControlsVisibilityManager)) {
             return;
         }
         mRunEnterAnimationOnCallback = false;
         runEnterAnimation();
     }

     @Override
     public void onBottomControlsHeightChanged(
             int bottomControlsHeight, int bottomControlsMinHeight) {
         mBottomControlsHeight = bottomControlsHeight;
         mShouldUpdateContainerLayoutParams = true;
     }

     @Override
     public void onTopControlsHeightChanged(int topControlsHeight, int topControlsMinHeight) {
         mShouldUpdateContainerLayoutParams = true;
     }

     @Override
     public void updateContainerHierarchy(boolean toFront) {
         super.updateContainerHierarchy(toFront);

         if (toFront == mContainerIsAtFront) return;
         mContainerIsAtFront = toFront;
         if (toFront) {
             getDialogContainer().bringToFront();
         } else {
             UiUtils.removeViewFromParent(getDialogContainer());
             UiUtils.insertBefore(mContainerParent, getDialogContainer(), mDefaultNextSiblingView);
         }
     }

     /**
      * Calculate the top margin of the dialog container and the dialog scrim so that the scrim
      * doesn't overlap the toolbar.
      * @param resources {@link Resources} to use to get the scrim vertical margin.
      * @param provider {@link BrowserControlsStateProvider} for browser controls heights.
      * @return The container top margin.
      */
     public static int getContainerTopMargin(
             Resources resources, BrowserControlsStateProvider provider) {
         int scrimVerticalMargin =
                 resources.getDimensionPixelSize(R.dimen.tab_modal_scrim_vertical_margin);
         return provider.getTopControlsHeight() - scrimVerticalMargin;
     }

     /**
      * Calculate the bottom margin of the dialog container.
      * @param provider {@link BrowserControlsStateProvider} for browser controls heights.
      * @return The container bottom margin.
      */
     public static int getContainerBottomMargin(BrowserControlsStateProvider provider) {
         return provider.getBottomControlsHeight();
     }

     public static boolean isDialogShowing(Tab tab) {
         return TabAttributes.from(tab).get(TabAttributeKeys.MODAL_DIALOG_SHOWING, false);
     }

     private void onTabModalDialogStateChanged(boolean isShowing) {
         TabAttributes.from(mActiveTab).set(TabAttributeKeys.MODAL_DIALOG_SHOWING, isShowing);
         mVisibilityDelegate.updateConstraintsForTab(mActiveTab);

         // Make sure to exit fullscreen mode before showing the tab modal dialog view.
         mFullscreenManager.onExitFullscreen(mActiveTab);

         // Also need to update browser control state after dismissal to refresh the constraints.
         if (isShowing && areRendererInputEventsIgnored()) {
             mBrowserControlsVisibilityManager.showAndroidControls(true);
         } else {
             TabBrowserControlsConstraintsHelper.update(mActiveTab, BrowserControlsState.SHOWN,
                     !mBrowserControlsVisibilityManager.offsetOverridden());
         }
     }

     private boolean areRendererInputEventsIgnored() {
         return mActiveTab.getWebContents().getMainFrame().areInputEventsIgnored();
     }

     @VisibleForTesting
     ViewGroup getContainerParentForTest() {
         return mContainerParent;
     }

     /**
      * Handles browser controls constraints for the TabModal dialogs.
      */
     static class TabModalBrowserControlsVisibilityDelegate
             extends BrowserControlsVisibilityDelegate {
         public TabModalBrowserControlsVisibilityDelegate() {
             super(BrowserControlsState.BOTH);
         }

         /**
          * Updates the tab modal browser constraints for the given tab.
          */
         public void updateConstraintsForTab(Tab tab) {
             if (tab == null) return;
             set(isDialogShowing(tab) ? BrowserControlsState.SHOWN : BrowserControlsState.BOTH);
         }
     }
 }
	// Copyright 2017 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	package org.chromium.chrome.browser.modaldialog;

	import android.content.res.Resources;
	import android.view.View;
	import android.view.ViewGroup;
	import android.view.ViewGroup.MarginLayoutParams;
	import android.view.ViewStub;

	import androidx.annotation.VisibleForTesting;

	import org.chromium.base.supplier.Supplier;
	import org.chromium.cc.input.BrowserControlsState;
	import org.chromium.chrome.R;
	import org.chromium.chrome.browser.app.ChromeActivity;
	import org.chromium.chrome.browser.browser_controls.BrowserControlsStateProvider;
	import org.chromium.chrome.browser.browser_controls.BrowserControlsUtils;
	import org.chromium.chrome.browser.browser_controls.BrowserControlsVisibilityManager;
	import org.chromium.chrome.browser.compositor.bottombar.OverlayPanel;
	import org.chromium.chrome.browser.contextualsearch.ContextualSearchManager;
	import org.chromium.chrome.browser.fullscreen.FullscreenManager;
	import org.chromium.chrome.browser.omnibox.OmniboxFocusReason;
	import org.chromium.chrome.browser.tab.Tab;
	import org.chromium.chrome.browser.tab.TabAttributeKeys;
	import org.chromium.chrome.browser.tab.TabAttributes;
	import org.chromium.chrome.browser.tab.TabBrowserControlsConstraintsHelper;
	import org.chromium.chrome.browser.ui.TabObscuringHandler;
	import org.chromium.components.browser_ui.modaldialog.TabModalPresenter;
	import org.chromium.components.browser_ui.util.BrowserControlsVisibilityDelegate;
	import org.chromium.content_public.browser.WebContents;
	import org.chromium.ui.UiUtils;
	import org.chromium.ui.modelutil.PropertyModel;
	import org.chromium.ui.util.TokenHolder;

	/**
	* This presenter creates tab modality by blocking interaction with select UI elements while a
	* dialog is visible.
	*/
	public class ChromeTabModalPresenter
	extends TabModalPresenter implements BrowserControlsStateProvider.Observer {
	/** The activity displaying the dialogs. */
	private final ChromeActivity mChromeActivity;
	private final Supplier<TabObscuringHandler> mTabObscuringHandlerSupplier;
	private final FullscreenManager mFullscreenManager;
	private final BrowserControlsVisibilityManager mBrowserControlsVisibilityManager;
	private final TabModalBrowserControlsVisibilityDelegate mVisibilityDelegate;

	/** The active tab of which the dialog will be shown on top. */
	private Tab mActiveTab;

	/** The parent view that contains the dialog container. */
	private ViewGroup mContainerParent;

	/** Whether the dialog container is brought to the front in its parent. */
	private boolean mContainerIsAtFront;

	/**
	* Whether an enter animation on the dialog container should run when
	* {@link #onBrowserControlsFullyVisible} is called.
	*/
	private boolean mRunEnterAnimationOnCallback;

	/**
	* The sibling view of the dialog container drawn next in its parent when it should be behind
	* browser controls. If BottomSheet is opened or UrlBar is focused, the dialog container should
	* be behind the browser controls and the URL suggestions.
	*/
	private View mDefaultNextSiblingView;

	private int mBottomControlsHeight;
	private boolean mShouldUpdateContainerLayoutParams;

	/** A token held while the dialog manager is obscuring all tabs. */
	private int mTabObscuringToken;

	/**
	* Constructor for initializing dialog container.
	* @param chromeActivity The activity displaying the dialogs.
	* @param tabObscuringHandler TabObscuringHandler object.
	*/
	public ChromeTabModalPresenter(
	ChromeActivity chromeActivity, Supplier<TabObscuringHandler> tabObscuringHandler) {
	super(chromeActivity);
	mChromeActivity = chromeActivity;
	mTabObscuringHandlerSupplier = tabObscuringHandler;
	mFullscreenManager = mChromeActivity.getFullscreenManager();
	mBrowserControlsVisibilityManager = mChromeActivity.getBrowserControlsManager();
	mBrowserControlsVisibilityManager.addObserver(this);
	mVisibilityDelegate = new TabModalBrowserControlsVisibilityDelegate();
	mTabObscuringToken = TokenHolder.INVALID_TOKEN;
	}

	public void destroy() {
	mBrowserControlsVisibilityManager.removeObserver(this);
	}

	/**
	* @return The browser controls visibility delegate associated with tab modal dialogs.
	*/
	public BrowserControlsVisibilityDelegate getBrowserControlsVisibilityDelegate() {
	return mVisibilityDelegate;
	}

	@Override
	protected ViewGroup createDialogContainer() {
	ViewStub dialogContainerStub =
	mChromeActivity.findViewById(R.id.tab_modal_dialog_container_stub);
	dialogContainerStub.setLayoutResource(R.layout.modal_dialog_container);

	ViewGroup dialogContainer = (ViewGroup) dialogContainerStub.inflate();
	dialogContainer.setVisibility(View.GONE);

	// Make sure clicks are not consumed by content beneath the container view.
	dialogContainer.setClickable(true);

	mContainerParent = (ViewGroup) dialogContainer.getParent();
	// The default sibling view is the next view of the dialog container stub in main.xml and
	// should not be removed from its parent.
	mDefaultNextSiblingView =
	mChromeActivity.findViewById(R.id.tab_modal_dialog_container_sibling_view);
	assert mDefaultNextSiblingView != null;

	Resources resources = mChromeActivity.getResources();

	MarginLayoutParams params = (MarginLayoutParams) dialogContainer.getLayoutParams();
	params.width = ViewGroup.MarginLayoutParams.MATCH_PARENT;
	params.height = ViewGroup.MarginLayoutParams.MATCH_PARENT;
	params.topMargin = getContainerTopMargin(resources, mBrowserControlsVisibilityManager);
	params.bottomMargin = getContainerBottomMargin(mBrowserControlsVisibilityManager);
	dialogContainer.setLayoutParams(params);

	int scrimVerticalMargin =
	resources.getDimensionPixelSize(R.dimen.tab_modal_scrim_vertical_margin);
	View scrimView = dialogContainer.findViewById(R.id.scrim);
	params = (MarginLayoutParams) scrimView.getLayoutParams();
	params.width = MarginLayoutParams.MATCH_PARENT;
	params.height = MarginLayoutParams.MATCH_PARENT;
	params.topMargin = scrimVerticalMargin;
	scrimView.setLayoutParams(params);

	return dialogContainer;
	}

	@Override
	protected void showDialogContainer() {
	if (mShouldUpdateContainerLayoutParams) {
	MarginLayoutParams params = (MarginLayoutParams) getDialogContainer().getLayoutParams();
	params.topMargin = getContainerTopMargin(
	mChromeActivity.getResources(), mBrowserControlsVisibilityManager);
	params.bottomMargin = mBottomControlsHeight;
	getDialogContainer().setLayoutParams(params);
	mShouldUpdateContainerLayoutParams = false;
	}

	// Don't show the dialog container before browser controls are guaranteed fully visible.
	if (BrowserControlsUtils.areBrowserControlsFullyVisible(
	mBrowserControlsVisibilityManager)) {
	runEnterAnimation();
	} else {
	mRunEnterAnimationOnCallback = true;
	}
	assert mTabObscuringToken == TokenHolder.INVALID_TOKEN;
	mTabObscuringToken = mTabObscuringHandlerSupplier.get().obscureAllTabs();
	}

	@Override
	protected void setBrowserControlsAccess(boolean restricted) {
	if (mChromeActivity.getToolbarManager() == null) return;

	View menuButton = mChromeActivity.getToolbarManager().getMenuButtonView();

	if (restricted) {
	mActiveTab = mChromeActivity.getActivityTab();
	assert mActiveTab
	!= null : "Tab modal dialogs should be shown on top of an active tab.";

	// Hide contextual search panel so that bottom toolbar will not be
	// obscured and back press is not overridden.
	ContextualSearchManager contextualSearchManager =
	mChromeActivity.getContextualSearchManager();
	if (contextualSearchManager != null) {
	contextualSearchManager.hideContextualSearch(
	OverlayPanel.StateChangeReason.UNKNOWN);
	}

	// Dismiss the action bar that obscures the dialogs but preserve the text selection.
	WebContents webContents = mActiveTab.getWebContents();
	if (webContents != null) {
	saveOrRestoreTextSelection(webContents, true);
	}

	// Force toolbar to show and disable overflow menu.
	onTabModalDialogStateChanged(true);

	mChromeActivity.getToolbarManager().setUrlBarFocus(false, OmniboxFocusReason.UNFOCUS);

	menuButton.setEnabled(false);
	} else {
	// Show the action bar back if it was dismissed when the dialogs were showing.
	WebContents webContents = mActiveTab.getWebContents();
	if (webContents != null) {
	saveOrRestoreTextSelection(webContents, false);
	}

	onTabModalDialogStateChanged(false);
	menuButton.setEnabled(true);
	mActiveTab = null;
	}
	}

	@Override
	protected void removeDialogView(PropertyModel model) {
	mRunEnterAnimationOnCallback = false;
	mTabObscuringHandlerSupplier.get().unobscureAllTabs(mTabObscuringToken);
	mTabObscuringToken = TokenHolder.INVALID_TOKEN;
	super.removeDialogView(model);
	}

	@Override
	public void onControlsOffsetChanged(int topOffset, int topControlsMinHeightOffset,
	int bottomOffset, int bottomControlsMinHeightOffset, boolean needsAnimate) {
	if (getDialogModel() == null \|\| !mRunEnterAnimationOnCallback
	\|\| !BrowserControlsUtils.areBrowserControlsFullyVisible(
	mBrowserControlsVisibilityManager)) {
	return;
	}
	mRunEnterAnimationOnCallback = false;
	runEnterAnimation();
	}

	@Override
	public void onBottomControlsHeightChanged(
	int bottomControlsHeight, int bottomControlsMinHeight) {
	mBottomControlsHeight = bottomControlsHeight;
	mShouldUpdateContainerLayoutParams = true;
	}

	@Override
	public void onTopControlsHeightChanged(int topControlsHeight, int topControlsMinHeight) {
	mShouldUpdateContainerLayoutParams = true;
	}

	@Override
	public void updateContainerHierarchy(boolean toFront) {
	super.updateContainerHierarchy(toFront);

	if (toFront == mContainerIsAtFront) return;
	mContainerIsAtFront = toFront;
	if (toFront) {
	getDialogContainer().bringToFront();
	} else {
	UiUtils.removeViewFromParent(getDialogContainer());
	UiUtils.insertBefore(mContainerParent, getDialogContainer(), mDefaultNextSiblingView);
	}
	}

	/**
	* Calculate the top margin of the dialog container and the dialog scrim so that the scrim
	* doesn't overlap the toolbar.
	* @param resources {@link Resources} to use to get the scrim vertical margin.
	* @param provider {@link BrowserControlsStateProvider} for browser controls heights.
	* @return The container top margin.
	*/
	public static int getContainerTopMargin(
	Resources resources, BrowserControlsStateProvider provider) {
	int scrimVerticalMargin =
	resources.getDimensionPixelSize(R.dimen.tab_modal_scrim_vertical_margin);
	return provider.getTopControlsHeight() - scrimVerticalMargin;
	}

	/**
	* Calculate the bottom margin of the dialog container.
	* @param provider {@link BrowserControlsStateProvider} for browser controls heights.
	* @return The container bottom margin.
	*/
	public static int getContainerBottomMargin(BrowserControlsStateProvider provider) {
	return provider.getBottomControlsHeight();
	}

	public static boolean isDialogShowing(Tab tab) {
	return TabAttributes.from(tab).get(TabAttributeKeys.MODAL_DIALOG_SHOWING, false);
	}

	private void onTabModalDialogStateChanged(boolean isShowing) {
	TabAttributes.from(mActiveTab).set(TabAttributeKeys.MODAL_DIALOG_SHOWING, isShowing);
	mVisibilityDelegate.updateConstraintsForTab(mActiveTab);

	// Make sure to exit fullscreen mode before showing the tab modal dialog view.
	mFullscreenManager.onExitFullscreen(mActiveTab);

	// Also need to update browser control state after dismissal to refresh the constraints.
	if (isShowing && areRendererInputEventsIgnored()) {
	mBrowserControlsVisibilityManager.showAndroidControls(true);
	} else {
	TabBrowserControlsConstraintsHelper.update(mActiveTab, BrowserControlsState.SHOWN,
	!mBrowserControlsVisibilityManager.offsetOverridden());
	}
	}

	private boolean areRendererInputEventsIgnored() {
	return mActiveTab.getWebContents().getMainFrame().areInputEventsIgnored();
	}

	@VisibleForTesting
	ViewGroup getContainerParentForTest() {
	return mContainerParent;
	}

	/**
	* Handles browser controls constraints for the TabModal dialogs.
	*/
	static class TabModalBrowserControlsVisibilityDelegate
	extends BrowserControlsVisibilityDelegate {
	public TabModalBrowserControlsVisibilityDelegate() {
	super(BrowserControlsState.BOTH);
	}

	/**
	* Updates the tab modal browser constraints for the given tab.
	*/
	public void updateConstraintsForTab(Tab tab) {
	if (tab == null) return;
	set(isDialogShowing(tab) ? BrowserControlsState.SHOWN : BrowserControlsState.BOTH);
	}
	}
	}