Java tutorial
/* * Copyright (C) 2011 The Android Open Source Project * * 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 g7.bluesky.launcher3; import android.content.Context; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.support.v4.content.ContextCompat; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import android.view.accessibility.AccessibilityManager; import android.widget.FrameLayout; public class AppsCustomizeTabHost extends FrameLayout implements LauncherTransitionable, Insettable { static final String LOG_TAG = "AppsCustomizeTabHost"; private static final String APPS_TAB_TAG = "APPS"; private static final String WIDGETS_TAB_TAG = "WIDGETS"; private AppsCustomizePagedView mPagedView; private View mContent; private boolean mInTransition = false; private final Rect mInsets = new Rect(); public AppsCustomizeTabHost(Context context, AttributeSet attrs) { super(context, attrs); } /** * Convenience methods to select specific tabs. We want to set the content type immediately * in these cases, but we note that we still call setCurrentTabByTag() so that the tab view * reflects the new content (but doesn't do the animation and logic associated with changing * tabs manually). */ void setContentTypeImmediate(AppsCustomizePagedView.ContentType type) { mPagedView.setContentType(type); } public void setCurrentTabFromContent(AppsCustomizePagedView.ContentType type) { setContentTypeImmediate(type); } @Override public void setInsets(Rect insets) { mInsets.set(insets); LayoutParams flp = (LayoutParams) mContent.getLayoutParams(); flp.topMargin = insets.top; flp.bottomMargin = insets.bottom; flp.leftMargin = insets.left; flp.rightMargin = insets.right; mContent.setLayoutParams(flp); } /** * Setup the tab host and create all necessary tabs. */ @Override protected void onFinishInflate() { mPagedView = (AppsCustomizePagedView) findViewById(R.id.apps_customize_pane_content); mContent = findViewById(R.id.content); } public void setBackground(Drawable d) { if (mContent != null) { mContent.setBackground(d); } } public String getContentTag() { return getTabTagForContentType(mPagedView.getContentType()); } /** * Returns the content type for the specified tab tag. */ public AppsCustomizePagedView.ContentType getContentTypeForTabTag(String tag) { if (tag.equals(APPS_TAB_TAG)) { return AppsCustomizePagedView.ContentType.Applications; } else if (tag.equals(WIDGETS_TAB_TAG)) { return AppsCustomizePagedView.ContentType.Widgets; } return AppsCustomizePagedView.ContentType.Applications; } /** * Returns the tab tag for a given content type. */ public String getTabTagForContentType(AppsCustomizePagedView.ContentType type) { if (type == AppsCustomizePagedView.ContentType.Applications) { return APPS_TAB_TAG; } else if (type == AppsCustomizePagedView.ContentType.Widgets) { return WIDGETS_TAB_TAG; } return APPS_TAB_TAG; } /** * Disable focus on anything under this view in the hierarchy if we are not visible. */ @Override public int getDescendantFocusability() { if (getVisibility() != View.VISIBLE) { return ViewGroup.FOCUS_BLOCK_DESCENDANTS; } return super.getDescendantFocusability(); } void reset() { // Reset immediately mPagedView.reset(); } void trimMemory() { mPagedView.trimMemory(); } public void onWindowVisible() { if (getVisibility() == VISIBLE) { mContent.setVisibility(VISIBLE); // We unload the widget previews when the UI is hidden, so need to reload pages // Load the current page synchronously, and the neighboring pages asynchronously mPagedView.loadAssociatedPages(mPagedView.getCurrentPage(), true); mPagedView.loadAssociatedPages(mPagedView.getCurrentPage()); } } @Override public ViewGroup getContent() { return mPagedView; } public boolean isInTransition() { return mInTransition; } /* LauncherTransitionable overrides */ @Override public void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean toWorkspace) { mPagedView.onLauncherTransitionPrepare(l, animated, toWorkspace); mInTransition = true; if (toWorkspace) { // Going from All Apps -> Workspace setVisibilityOfSiblingsWithLowerZOrder(VISIBLE); } else { // Going from Workspace -> All Apps mContent.setVisibility(VISIBLE); // Make sure the current page is loaded (we start loading the side pages after the // transition to prevent slowing down the animation) // TODO: revisit this mPagedView.loadAssociatedPages(mPagedView.getCurrentPage()); } } @Override public void onLauncherTransitionStart(Launcher l, boolean animated, boolean toWorkspace) { mPagedView.onLauncherTransitionStart(l, animated, toWorkspace); } @Override public void onLauncherTransitionStep(Launcher l, float t) { mPagedView.onLauncherTransitionStep(l, t); } @Override public void onLauncherTransitionEnd(Launcher l, boolean animated, boolean toWorkspace) { mPagedView.onLauncherTransitionEnd(l, animated, toWorkspace); mInTransition = false; if (!toWorkspace) { // Make sure adjacent pages are loaded (we wait until after the transition to // prevent slowing down the animation) mPagedView.loadAssociatedPages(mPagedView.getCurrentPage()); // Opening apps, need to announce what page we are on. AccessibilityManager am = (AccessibilityManager) getContext() .getSystemService(Context.ACCESSIBILITY_SERVICE); if (am.isEnabled()) { // Notify the user when the page changes announceForAccessibility(mPagedView.getCurrentPageDescription()); } // Going from Workspace -> All Apps // NOTE: We should do this at the end since we check visibility state in some of the // cling initialization/dismiss code above. setVisibilityOfSiblingsWithLowerZOrder(INVISIBLE); } } private void setVisibilityOfSiblingsWithLowerZOrder(int visibility) { ViewGroup parent = (ViewGroup) getParent(); if (parent == null) return; View overviewPanel = ((Launcher) getContext()).getOverviewPanel(); final int count = parent.getChildCount(); if (!isChildrenDrawingOrderEnabled()) { for (int i = 0; i < count; i++) { final View child = parent.getChildAt(i); if (child == this) { break; } else { if (child.getVisibility() == GONE || child == overviewPanel) { continue; } child.setVisibility(visibility); } } } else { throw new RuntimeException("Failed; can't get z-order of views"); } } }