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Diffstat (limited to 'android/src/main/java/com/google/samples/apps/iosched/ui/widget/SwipeProgressBar.java')
-rw-r--r--android/src/main/java/com/google/samples/apps/iosched/ui/widget/SwipeProgressBar.java267
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diff --git a/android/src/main/java/com/google/samples/apps/iosched/ui/widget/SwipeProgressBar.java b/android/src/main/java/com/google/samples/apps/iosched/ui/widget/SwipeProgressBar.java
deleted file mode 100644
index f12b14e..0000000
--- a/android/src/main/java/com/google/samples/apps/iosched/ui/widget/SwipeProgressBar.java
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@@ -1,267 +0,0 @@
-/*
- * Copyright 2014 Google Inc. All rights reserved.
- *
- * 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.google.samples.apps.iosched.ui.widget;
-
-import android.graphics.Canvas;
-import android.graphics.Paint;
-import android.graphics.Rect;
-import android.graphics.RectF;
-import android.support.v4.view.ViewCompat;
-import android.view.View;
-import android.view.animation.AnimationUtils;
-import android.view.animation.Interpolator;
-
-
-/**
- * Custom progress bar that shows a cycle of colors as widening circles that
- * overdraw each other. When finished, the bar is cleared from the inside out as
- * the main cycle continues. Before running, this can also indicate how close
- * the user is to triggering something (e.g. how far they need to pull down to
- * trigger a refresh).
- */
-final class SwipeProgressBar {
-
- // Default progress animation colors are grays.
- private final static int COLOR1 = 0xB3000000;
- private final static int COLOR2 = 0x80000000;
- private final static int COLOR3 = 0x4d000000;
- private final static int COLOR4 = 0x1a000000;
-
- // The duration of the animation cycle.
- private static final int ANIMATION_DURATION_MS = 2000;
-
- // The duration of the animation to clear the bar.
- private static final int FINISH_ANIMATION_DURATION_MS = 1000;
-
- // Interpolator for varying the speed of the animation.
- private static final Interpolator INTERPOLATOR = BakedBezierInterpolator.getInstance();
-
- private final Paint mPaint = new Paint();
- private final RectF mClipRect = new RectF();
- private float mTriggerPercentage;
- private long mStartTime;
- private long mFinishTime;
- private boolean mRunning;
-
- // Colors used when rendering the animation,
- private int mColor1;
- private int mColor2;
- private int mColor3;
- private int mColor4;
- private View mParent;
-
- private Rect mBounds = new Rect();
-
- public SwipeProgressBar(View parent) {
- mParent = parent;
- mColor1 = COLOR1;
- mColor2 = COLOR2;
- mColor3 = COLOR3;
- mColor4 = COLOR4;
- }
-
- /**
- * Set the four colors used in the progress animation. The first color will
- * also be the color of the bar that grows in response to a user swipe
- * gesture.
- *
- * @param color1 Integer representation of a color.
- * @param color2 Integer representation of a color.
- * @param color3 Integer representation of a color.
- * @param color4 Integer representation of a color.
- */
- void setColorScheme(int color1, int color2, int color3, int color4) {
- mColor1 = color1;
- mColor2 = color2;
- mColor3 = color3;
- mColor4 = color4;
- }
-
- /**
- * Update the progress the user has made toward triggering the swipe
- * gesture. and use this value to update the percentage of the trigger that
- * is shown.
- */
- void setTriggerPercentage(float triggerPercentage) {
- mTriggerPercentage = triggerPercentage;
- mStartTime = 0;
- ViewCompat.postInvalidateOnAnimation(mParent);
- }
-
- /**
- * Start showing the progress animation.
- */
- void start() {
- if (!mRunning) {
- mTriggerPercentage = 0;
- mStartTime = AnimationUtils.currentAnimationTimeMillis();
- mRunning = true;
- mParent.postInvalidate();
- }
- }
-
- /**
- * Stop showing the progress animation.
- */
- void stop() {
- if (mRunning) {
- mTriggerPercentage = 0;
- mFinishTime = AnimationUtils.currentAnimationTimeMillis();
- mRunning = false;
- mParent.postInvalidate();
- }
- }
-
- /**
- * @return Return whether the progress animation is currently running.
- */
- boolean isRunning() {
- return mRunning || mFinishTime > 0;
- }
-
- void draw(Canvas canvas) {
- final int width = mBounds.width();
- final int cx = width / 2;
- final int cy = mBounds.top + mBounds.height() / 2;
- boolean drawTriggerWhileFinishing = false;
- int restoreCount = canvas.save();
- canvas.clipRect(mBounds);
- if (mRunning || (mFinishTime > 0)) {
- long now = AnimationUtils.currentAnimationTimeMillis();
- long elapsed = (now - mStartTime) % ANIMATION_DURATION_MS;
- long iterations = (now - mStartTime) / ANIMATION_DURATION_MS;
- float rawProgress = (elapsed / (ANIMATION_DURATION_MS / 100f));
- // If we're not running anymore, that means we're running through
- // the finish animation.
- if (!mRunning) {
- // If the finish animation is done, don't draw anything, and
- // don't repost.
- if ((now - mFinishTime) >= FINISH_ANIMATION_DURATION_MS) {
- mFinishTime = 0;
- return;
- }
- // Otherwise, use a 0 opacity alpha layer to clear the animation
- // from the inside out. This layer will prevent the circles from
- // drawing within its bounds.
- long finishElapsed = (now - mFinishTime) % FINISH_ANIMATION_DURATION_MS;
- float finishProgress = (finishElapsed / (FINISH_ANIMATION_DURATION_MS / 100f));
- float pct = (finishProgress / 100f);
- // Radius of the circle is half of the screen.
- float clearRadius = width / 2 * INTERPOLATOR.getInterpolation(pct);
- mClipRect.set(cx - clearRadius, mBounds.top, cx + clearRadius, mBounds.bottom);
- canvas.saveLayerAlpha(mClipRect, 0, 0);
- // Only draw the trigger if there is a space in the center of
- // this refreshing view that needs to be filled in by the
- // trigger. If the progress view is just still animating, let it
- // continue animating.
- drawTriggerWhileFinishing = true;
- }
- // First fill in with the last color that would have finished drawing.
- if (iterations == 0) {
- canvas.drawColor(mColor1);
- } else {
- if (rawProgress >= 0 && rawProgress < 25) {
- canvas.drawColor(mColor4);
- } else if (rawProgress >= 25 && rawProgress < 50) {
- canvas.drawColor(mColor1);
- } else if (rawProgress >= 50 && rawProgress < 75) {
- canvas.drawColor(mColor2);
- } else {
- canvas.drawColor(mColor3);
- }
- }
- // Then draw up to 4 overlapping concentric circles of varying radii, based on how far
- // along we are in the cycle.
- // progress 0-50 draw mColor2
- // progress 25-75 draw mColor3
- // progress 50-100 draw mColor4
- // progress 75 (wrap to 25) draw mColor1
- if ((rawProgress >= 0 && rawProgress <= 25)) {
- float pct = (((rawProgress + 25) * 2) / 100f);
- drawCircle(canvas, cx, cy, mColor1, pct);
- }
- if (rawProgress >= 0 && rawProgress <= 50) {
- float pct = ((rawProgress * 2) / 100f);
- drawCircle(canvas, cx, cy, mColor2, pct);
- }
- if (rawProgress >= 25 && rawProgress <= 75) {
- float pct = (((rawProgress - 25) * 2) / 100f);
- drawCircle(canvas, cx, cy, mColor3, pct);
- }
- if (rawProgress >= 50 && rawProgress <= 100) {
- float pct = (((rawProgress - 50) * 2) / 100f);
- drawCircle(canvas, cx, cy, mColor4, pct);
- }
- if ((rawProgress >= 75 && rawProgress <= 100)) {
- float pct = (((rawProgress - 75) * 2) / 100f);
- drawCircle(canvas, cx, cy, mColor1, pct);
- }
- if (mTriggerPercentage > 0 && drawTriggerWhileFinishing) {
- // There is some portion of trigger to draw. Restore the canvas,
- // then draw the trigger. Otherwise, the trigger does not appear
- // until after the bar has finished animating and appears to
- // just jump in at a larger width than expected.
- canvas.restoreToCount(restoreCount);
- restoreCount = canvas.save();
- canvas.clipRect(mBounds);
- drawTrigger(canvas, cx, cy);
- }
- // Keep running until we finish out the last cycle.
- ViewCompat.postInvalidateOnAnimation(mParent);
- } else {
- // Otherwise if we're in the middle of a trigger, draw that.
- if (mTriggerPercentage > 0 && mTriggerPercentage <= 1.0) {
- drawTrigger(canvas, cx, cy);
- }
- }
- canvas.restoreToCount(restoreCount);
- }
-
- private void drawTrigger(Canvas canvas, int cx, int cy) {
- mPaint.setColor(mColor1);
- canvas.drawCircle(cx, cy, cx * mTriggerPercentage, mPaint);
- }
-
- /**
- * Draws a circle centered in the view.
- *
- * @param canvas the canvas to draw on
- * @param cx the center x coordinate
- * @param cy the center y coordinate
- * @param color the color to draw
- * @param pct the percentage of the view that the circle should cover
- */
- private void drawCircle(Canvas canvas, float cx, float cy, int color, float pct) {
- mPaint.setColor(color);
- canvas.save();
- canvas.translate(cx, cy);
- float radiusScale = INTERPOLATOR.getInterpolation(pct);
- canvas.scale(radiusScale, radiusScale);
- canvas.drawCircle(0, 0, cx, mPaint);
- canvas.restore();
- }
-
- /**
- * Set the drawing bounds of this SwipeProgressBar.
- */
- void setBounds(int left, int top, int right, int bottom) {
- mBounds.left = left;
- mBounds.top = top;
- mBounds.right = right;
- mBounds.bottom = bottom;
- }
-}
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