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author | Mike Dodd <mdodd@google.com> | 2015-08-11 11:16:59 -0700 |
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committer | Mike Dodd <mdodd@google.com> | 2015-08-12 08:58:28 -0700 |
commit | 461a34b466cb4b13dbbc2ec6330b31e217b2ac4e (patch) | |
tree | bc4b489af52d0e2521e21167d2ad76a47256f348 /src/com/android/messaging/ui/ViewPagerTabStrip.java | |
parent | 8b3e2b9c1b0a09423a7ba5d1091b9192106502f8 (diff) | |
download | android_packages_apps_Messaging-461a34b466cb4b13dbbc2ec6330b31e217b2ac4e.tar.gz android_packages_apps_Messaging-461a34b466cb4b13dbbc2ec6330b31e217b2ac4e.tar.bz2 android_packages_apps_Messaging-461a34b466cb4b13dbbc2ec6330b31e217b2ac4e.zip |
Initial checkin of AOSP Messaging app.
b/23110861
Change-Id: I9aa980d7569247d6b2ca78f5dcb4502e1eaadb8a
Diffstat (limited to 'src/com/android/messaging/ui/ViewPagerTabStrip.java')
-rw-r--r-- | src/com/android/messaging/ui/ViewPagerTabStrip.java | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/src/com/android/messaging/ui/ViewPagerTabStrip.java b/src/com/android/messaging/ui/ViewPagerTabStrip.java new file mode 100644 index 0000000..e088296 --- /dev/null +++ b/src/com/android/messaging/ui/ViewPagerTabStrip.java @@ -0,0 +1,102 @@ +/* + * Copyright (C) 2015 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 com.android.messaging.ui; + +import android.content.Context; +import android.content.res.Resources; +import android.graphics.Canvas; +import android.graphics.Paint; +import android.util.AttributeSet; +import android.view.View; +import android.widget.LinearLayout; + +import com.android.messaging.R; +import com.android.messaging.util.OsUtil; + +public class ViewPagerTabStrip extends LinearLayout { + private int mSelectedUnderlineThickness; + private final Paint mSelectedUnderlinePaint; + + private int mIndexForSelection; + private float mSelectionOffset; + + public ViewPagerTabStrip(Context context) { + this(context, null); + } + + public ViewPagerTabStrip(Context context, AttributeSet attrs) { + super(context, attrs); + + final Resources res = context.getResources(); + + mSelectedUnderlineThickness = + res.getDimensionPixelSize(R.dimen.pager_tab_underline_selected); + int underlineColor = res.getColor(R.color.contact_picker_tab_underline); + int backgroundColor = res.getColor(R.color.action_bar_background_color); + + mSelectedUnderlinePaint = new Paint(); + mSelectedUnderlinePaint.setColor(underlineColor); + + setBackgroundColor(backgroundColor); + setWillNotDraw(false); + } + + /** + * Notifies this view that view pager has been scrolled. We save the tab index + * and selection offset for interpolating the position and width of selection + * underline. + */ + void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { + mIndexForSelection = position; + mSelectionOffset = positionOffset; + invalidate(); + } + + @Override + protected void onDraw(Canvas canvas) { + int childCount = getChildCount(); + + // Thick colored underline below the current selection + if (childCount > 0) { + View selectedTitle = getChildAt(mIndexForSelection); + int selectedLeft = selectedTitle.getLeft(); + int selectedRight = selectedTitle.getRight(); + final boolean isRtl = isRtl(); + final boolean hasNextTab = isRtl ? mIndexForSelection > 0 + : (mIndexForSelection < (getChildCount() - 1)); + if ((mSelectionOffset > 0.0f) && hasNextTab) { + // Draw the selection partway between the tabs + View nextTitle = getChildAt(mIndexForSelection + (isRtl ? -1 : 1)); + int nextLeft = nextTitle.getLeft(); + int nextRight = nextTitle.getRight(); + + selectedLeft = (int) (mSelectionOffset * nextLeft + + (1.0f - mSelectionOffset) * selectedLeft); + selectedRight = (int) (mSelectionOffset * nextRight + + (1.0f - mSelectionOffset) * selectedRight); + } + + int height = getHeight(); + canvas.drawRect(selectedLeft, height - mSelectedUnderlineThickness, + selectedRight, height, mSelectedUnderlinePaint); + } + } + + private boolean isRtl() { + return OsUtil.isAtLeastJB_MR2() ? getLayoutDirection() == View.LAYOUT_DIRECTION_RTL : false; + } +}
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