aixan/lawnchair
1
0
Fork 0
mirror of https://github.com/LawnchairLauncher/lawnchair.git synced 2026-03-01 08:16:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

Adding shadow to fast scroll indicator

Browse Source 
Bug: 29761848
Change-Id: I9db7e73fb6b8c703be21a6c3f9e2a50253a48ec7
This commit is contained in:
Peter Schiller
2016-06-29 09:46:43 -07:00
parent 3ddb64efb5
commit 1d62b8a7fc
2 changed files with 61 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
src/com/android/launcher3/BaseRecyclerViewFastScrollPopup.java
View File

@@ -18,6 +18,7 @@ package com.android.launcher3;
import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
@@ -31,9 +32,16 @@ public class BaseRecyclerViewFastScrollPopup {
private static final float FAST_SCROLL_OVERLAY_Y_OFFSET_FACTOR = 1.5f;
private static final int SHADOW_INSET = 6;
private static final int SHADOW_SHIFT_Y = 4;
private static final float SHADOW_ALPHA_MULTIPLIER = 0.6f;
private Resources mRes;
private BaseRecyclerView mRv;
private Bitmap mShadow;
private Paint mShadowPaint;
private Drawable mBg;
// The absolute bounds of the fast scroller bg
private Rect mBgBounds = new Rect();
@@ -52,13 +60,20 @@ public class BaseRecyclerViewFastScrollPopup {
public BaseRecyclerViewFastScrollPopup(BaseRecyclerView rv, Resources res) {
mRes = res;
mRv = rv;
mBgOriginalSize = res.getDimensionPixelSize(R.dimen.container_fastscroll_popup_size);
mBg = rv.getContext().getDrawable(R.drawable.container_fastscroll_popup_bg);
mBg.setBounds(0, 0, mBgOriginalSize, mBgOriginalSize);
mTextPaint = new Paint();
mTextPaint.setColor(Color.WHITE);
mTextPaint.setAntiAlias(true);
mTextPaint.setTextSize(res.getDimensionPixelSize(R.dimen.container_fastscroll_popup_text_size));
mShadowPaint = new Paint();
mShadowPaint.setAntiAlias(true);
mShadowPaint.setFilterBitmap(true);
mShadowPaint.setDither(true);
}
/**
@@ -75,6 +90,7 @@ public class BaseRecyclerViewFastScrollPopup {
/**
* Updates the bounds for the fast scroller.
*
* @return the invalidation rect for this update.
*/
public Rect updateFastScrollerBounds(int lastTouchY) {
@@ -98,6 +114,10 @@ public class BaseRecyclerViewFastScrollPopup {
mBgBounds.top = Math.max(edgePadding,
Math.min(mBgBounds.top, mRv.getHeight() - edgePadding - bgHeight));
mBgBounds.bottom = mBgBounds.top + bgHeight;
// Generate a bitmap for a shadow matching these bounds
mShadow = HolographicOutlineHelper.obtain(
mRv.getContext()).createMediumDropShadow(mBg, false /* shouldCache */);
} else {
mBgBounds.setEmpty();
}
@@ -138,17 +158,32 @@ public class BaseRecyclerViewFastScrollPopup {
public void draw(Canvas c) {
if (isVisible()) {
// Draw the fast scroller popup
// Determine the alpha and prepare the canvas
final int alpha = (int) (mAlpha * 255);
int restoreCount = c.save(Canvas.MATRIX_SAVE_FLAG);
c.translate(mBgBounds.left, mBgBounds.top);
mTmpRect.set(mBgBounds);
mTmpRect.offsetTo(0, 0);
// Expand the rect (with a negative inset), translate it, and draw the shadow
if (mShadow != null) {
mTmpRect.inset(-SHADOW_INSET * 2, -SHADOW_INSET * 2);
mTmpRect.offset(0, SHADOW_SHIFT_Y);
mShadowPaint.setAlpha((int) (alpha * SHADOW_ALPHA_MULTIPLIER));
c.drawBitmap(mShadow, null, mTmpRect, mShadowPaint);
mTmpRect.inset(SHADOW_INSET * 2, SHADOW_INSET * 2);
mTmpRect.offset(0, -SHADOW_SHIFT_Y);
}
// Draw the background
mBg.setBounds(mTmpRect);
mBg.setAlpha((int) (mAlpha * 255));
mBg.setAlpha(alpha);
mBg.draw(c);
mTextPaint.setAlpha((int) (mAlpha * 255));
// Draw the text
mTextPaint.setAlpha(alpha);
c.drawText(mSectionName, (mBgBounds.width() - mTextBounds.width()) / 2,
mBgBounds.height() - (mBgBounds.height() - mTextBounds.height()) / 2,
mBgBounds.height() - (mBgBounds.height() / 2) - mTextBounds.exactCenterY(),
mTextPaint);
c.restoreToCount(restoreCount);
}