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133 changes: 133 additions & 0 deletions
133
app/src/main/java/org/chromium/chrome/browser/firstrun/TabbedModeFirstRunActivity.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // 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. | ||
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| package org.chromium.chrome.browser.firstrun; | ||
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| import android.content.Context; | ||
| import android.content.res.Resources; | ||
| import android.support.annotation.AnyRes; | ||
| import android.util.DisplayMetrics; | ||
| import android.util.TypedValue; | ||
| import android.view.Gravity; | ||
| import android.view.View; | ||
| import android.view.ViewGroup; | ||
| import android.widget.FrameLayout; | ||
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| import org.chromium.chrome.R; | ||
|
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| /** | ||
| * FirstRunActivity variant that fills the whole screen, but displays the content | ||
| * in a dialog-like layout. | ||
| */ | ||
| public class TabbedModeFirstRunActivity extends FirstRunActivity { | ||
| @Override | ||
| protected View createContentView() { | ||
| return wrapInDialogLayout(super.createContentView()); | ||
| } | ||
|
|
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| /** | ||
| * Wraps contentView into layout that resembles DialogWhenLarge. The layout centers | ||
| * the content and dims the background to simulate a modal dialog. | ||
| */ | ||
| private View wrapInDialogLayout(View contentView) { | ||
| ContentLayout contentLayout = new ContentLayout(this); | ||
| contentLayout.addView(contentView); | ||
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| contentLayout.setBackgroundResource(R.drawable.bg_white_dialog); | ||
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| // We need an outer layout for two things: | ||
| // * centering the content | ||
| // * dimming the background | ||
| FrameLayout outerLayout = new FrameLayout(this); | ||
| outerLayout.addView(contentLayout, | ||
| new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, | ||
| ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.CENTER)); | ||
| outerLayout.setBackgroundResource(R.color.modal_dialog_scrim_color); | ||
| return outerLayout; | ||
| } | ||
|
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| /** | ||
| * Layout that sizes itself according to DialogWhenLarge constraints. | ||
| */ | ||
| private static class ContentLayout extends FrameLayout { | ||
| private TypedValue mFixedWidthMajor = new TypedValue(); | ||
| private TypedValue mFixedWidthMinor = new TypedValue(); | ||
| private TypedValue mFixedHeightMajor = new TypedValue(); | ||
| private TypedValue mFixedHeightMinor = new TypedValue(); | ||
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| public ContentLayout(Context context) { | ||
| super(context); | ||
| fetchConstraints(); | ||
| } | ||
|
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| /** | ||
| * Wrapper around Resources.getValue() that translates Resources.NotFoundException | ||
| * into false return value. Otherwise the function returns true. | ||
| */ | ||
| private boolean safeGetResourceValue(@AnyRes int id, TypedValue value) { | ||
| try { | ||
| getContext().getResources().getValue(id, value, true); | ||
| return true; | ||
| } catch (Resources.NotFoundException e) { | ||
| return false; | ||
| } | ||
| } | ||
|
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| private void fetchConstraints() { | ||
| // Fetch size constraints. These are copies of corresponding abc_* AppCompat values, | ||
| // because abc_* values are private, and even though corresponding theme attributes | ||
| // are public in AppCompat (e.g. windowFixedWidthMinor), there is no guarantee that | ||
| // AppCompat.DialogWhenLarge is actually defined by AppCompat and not based on | ||
| // system DialogWhenLarge theme. | ||
| // Note that we don't care about the return values, because onMeasure() handles null | ||
| // constraints (and they will be null when the device is not considered "large"). | ||
| safeGetResourceValue(R.dimen.dialog_fixed_width_minor, mFixedWidthMinor); | ||
| safeGetResourceValue(R.dimen.dialog_fixed_width_major, mFixedWidthMajor); | ||
| safeGetResourceValue(R.dimen.dialog_fixed_height_minor, mFixedHeightMinor); | ||
| safeGetResourceValue(R.dimen.dialog_fixed_height_major, mFixedHeightMajor); | ||
| } | ||
|
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| @Override | ||
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | ||
| final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics(); | ||
| final boolean isPortrait = metrics.widthPixels < metrics.heightPixels; | ||
|
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| // Constraint handling is adapted from | ||
| // sdk/sources/android-25/android/support/v7/widget/ContentFrameLayout.java. | ||
| final int widthMode = MeasureSpec.getMode(widthMeasureSpec); | ||
| assert widthMode == MeasureSpec.AT_MOST; | ||
| { | ||
| final TypedValue tvw = isPortrait ? mFixedWidthMinor : mFixedWidthMajor; | ||
| int widthSize = MeasureSpec.getSize(widthMeasureSpec); | ||
| if (tvw.type != TypedValue.TYPE_NULL) { | ||
| assert tvw.type == TypedValue.TYPE_FRACTION; | ||
| int width = (int) tvw.getFraction(metrics.widthPixels, metrics.widthPixels); | ||
| widthSize = Math.min(width, widthSize); | ||
| } | ||
| // This either sets the width calculated from the constraints, or simply | ||
| // takes all of the available space (as if MATCH_PARENT was specified). | ||
| // The behavior is similar to how DialogWhenLarge windows are sized - they | ||
| // are either sized by the constraints, or are full screen, but are never | ||
| // sized based on the content size. | ||
| widthMeasureSpec = MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.EXACTLY); | ||
| } | ||
|
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| // This is similar to the above block that calculates width. | ||
| final int heightMode = MeasureSpec.getMode(heightMeasureSpec); | ||
| assert heightMode == MeasureSpec.AT_MOST; | ||
| { | ||
| final TypedValue tvh = isPortrait ? mFixedHeightMajor : mFixedHeightMinor; | ||
| int heightSize = MeasureSpec.getSize(heightMeasureSpec); | ||
| if (tvh.type != TypedValue.TYPE_NULL) { | ||
| assert tvh.type == TypedValue.TYPE_FRACTION; | ||
| int height = (int) tvh.getFraction(metrics.heightPixels, metrics.heightPixels); | ||
| heightSize = Math.min(height, heightSize); | ||
| } | ||
| heightMeasureSpec = MeasureSpec.makeMeasureSpec(heightSize, MeasureSpec.EXACTLY); | ||
| } | ||
|
|
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| super.onMeasure(widthMeasureSpec, heightMeasureSpec); | ||
| } | ||
| } | ||
| } |
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