Java tutorial
/* * Copyright 2015 Hippo Seven * * 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.hippo.nimingban.widget; import android.animation.ValueAnimator; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.drawable.Drawable; import android.support.annotation.IntDef; import android.support.v4.view.MotionEventCompat; import android.support.v4.widget.ViewDragHelper; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.InputMethodManager; import android.widget.FrameLayout; import com.hippo.nimingban.R; import com.hippo.util.AnimationUtils2; import com.hippo.yorozuya.LayoutUtils; import com.hippo.yorozuya.MathUtils; import com.hippo.yorozuya.ViewUtils; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; public final class PostLayout extends FrameLayout { @IntDef({ STATE_NONE, STATE_SHOW, STATE_HIDE }) @Retention(RetentionPolicy.SOURCE) private @interface State { } public static final int STATE_NONE = 0; public static final int STATE_SHOW = 1; public static final int STATE_HIDE = 2; private ViewDragHelper mDragHelper; private Drawable mShadowTop; private int mShadowHeight; private float mX; private float mY; private int mThreshold; private ValueAnimator mHideTypeSendAnimation; private ValueAnimator mShowTypeSendAnimation; public PostLayout(Context context) { super(context); init(context); } public PostLayout(Context context, AttributeSet attrs) { super(context, attrs); init(context); } public PostLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } private void init(Context context) { mDragHelper = ViewDragHelper.create(this, 1.0f, new DragHelperCallback()); mShadowTop = context.getResources().getDrawable(R.drawable.shadow_top); mShadowHeight = LayoutUtils.dp2pix(context, 8); mThreshold = LayoutUtils.dp2pix(context, 48); mHideTypeSendAnimation = new ValueAnimator(); mHideTypeSendAnimation.setDuration(300); mHideTypeSendAnimation.setInterpolator(AnimationUtils2.FAST_SLOW_INTERPOLATOR); mHideTypeSendAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { View view = getChildAt(1); if (view != null) { int value = (Integer) animation.getAnimatedValue(); view.offsetTopAndBottom(value - view.getTop()); ((LayoutParams) view.getLayoutParams()).offsetY = value; invalidate(); } } }); mShowTypeSendAnimation = new ValueAnimator(); mShowTypeSendAnimation.setDuration(300); mShowTypeSendAnimation.setInterpolator(AnimationUtils2.FAST_SLOW_INTERPOLATOR); mShowTypeSendAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { View view = getChildAt(1); if (view != null) { int value = (Integer) animation.getAnimatedValue(); view.offsetTopAndBottom(value - view.getTop()); ((LayoutParams) view.getLayoutParams()).offsetY = value; invalidate(); } } }); } @State public int getTypeSendState() { View typeSendView = getChildAt(1); if (typeSendView == null) { return STATE_NONE; } else { LayoutParams lp = (LayoutParams) typeSendView.getLayoutParams(); return lp.hide ? STATE_HIDE : STATE_SHOW; } } public void onRemoveTypeSend() { // Reset post view bottom margin View postView = getChildAt(0); if (postView != null) { LayoutParams lp = (LayoutParams) postView.getLayoutParams(); lp.bottomMargin = 0; postView.setLayoutParams(lp); } } public void hideTypeSend() { mHideTypeSendAnimation.cancel(); mShowTypeSendAnimation.cancel(); View typeSendView = getChildAt(1); if (typeSendView == null) { return; } LayoutParams lp = (LayoutParams) typeSendView.getLayoutParams(); lp.hide = true; int start = typeSendView.getTop(); int end = getHeight() - typeSendView.findViewById(R.id.toolbar).getHeight(); if (start != end) { mHideTypeSendAnimation.setIntValues(start, end); mHideTypeSendAnimation.start(); } // Add post view bottom margin View postView = getChildAt(0); if (postView != null) { lp = (LayoutParams) postView.getLayoutParams(); lp.bottomMargin = typeSendView.findViewById(R.id.toolbar).getHeight(); postView.setLayoutParams(lp); } } public void showTypeSend() { mHideTypeSendAnimation.cancel(); mShowTypeSendAnimation.cancel(); View typeSendView = getChildAt(1); if (typeSendView == null) { return; } LayoutParams lp = (LayoutParams) typeSendView.getLayoutParams(); lp.hide = false; int start = typeSendView.getTop(); int end = 0; if (start != end) { mShowTypeSendAnimation.setIntValues(start, end); mShowTypeSendAnimation.start(); } } @Override protected boolean drawChild(Canvas canvas, View child, long drawingTime) { boolean result = super.drawChild(canvas, child, drawingTime); int top = child.getTop(); if (1 == indexOfChild(child) && top > 0) { mShadowTop.setBounds(0, top - mShadowHeight, child.getRight(), top); mShadowTop.draw(canvas); } return result; } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); for (int i = 0, count = getChildCount(); i < count; i++) { View child = getChildAt(i); if (GONE == child.getVisibility()) { continue; } LayoutParams lp = (LayoutParams) child.getLayoutParams(); child.offsetLeftAndRight(lp.offsetX); child.offsetTopAndBottom(lp.offsetY); } } // ime keyboard may change window size @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { View typeSendView = getChildAt(1); if (typeSendView != null) { LayoutParams lp = (LayoutParams) typeSendView.getLayoutParams(); if (lp.hide) { mHideTypeSendAnimation.cancel(); mShowTypeSendAnimation.cancel(); int top = getHeight() - typeSendView.findViewById(R.id.toolbar).getHeight(); typeSendView.offsetTopAndBottom(top - typeSendView.getTop()); lp.offsetY = top; } } } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { mX = ev.getX(); mY = ev.getY(); final int action = MotionEventCompat.getActionMasked(ev); if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { mDragHelper.cancel(); return false; } else { return mDragHelper.shouldInterceptTouchEvent(ev); } } private void handleTypeSendState() { View view = getChildAt(1); if (view == null) { return; } int top = view.getTop(); LayoutParams lp = (LayoutParams) view.getLayoutParams(); if (lp.hide) { if (top < getHeight() - view.findViewById(R.id.toolbar).getHeight() - mThreshold) { showTypeSend(); } else { hideTypeSend(); } } else { if (top > mThreshold) { hideTypeSend(); } else { showTypeSend(); } } } @Override public boolean onTouchEvent(MotionEvent ev) { mX = ev.getX(); mY = ev.getY(); mDragHelper.processTouchEvent(ev); final int action = MotionEventCompat.getActionMasked(ev); if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { handleTypeSendState(); } return true; } private class DragHelperCallback extends ViewDragHelper.Callback { @Override public boolean tryCaptureView(View child, int pointerId) { if (child.getId() == R.id.type_send) { View view = child.findViewById(R.id.toolbar); if (view != null) { return ViewUtils.isViewUnder(view, (int) mX, (int) mY - child.getTop(), 0); } } return false; } @Override public int clampViewPositionVertical(View child, int top, int dy) { if (child.getId() == R.id.type_send) { View view = child.findViewById(R.id.toolbar); if (view != null) { return MathUtils.clamp(top, 0, getHeight() - view.getHeight()); } } return top; } @Override public int getViewVerticalDragRange(View child) { if (child.getId() == R.id.type_send) { View view = child.findViewById(R.id.toolbar); if (view != null) { return getHeight() - view.getHeight(); } } return 0; } @Override public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) { if (changedView.getId() == R.id.type_send) { LayoutParams lp = (LayoutParams) changedView.getLayoutParams(); lp.offsetY = top; } // Hide ime keyboard Context context = getContext(); if (context instanceof Activity) { View focusView = ((Activity) context).getCurrentFocus(); if (focusView != null) { InputMethodManager imm = (InputMethodManager) getContext() .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(focusView.getWindowToken(), 0); } } invalidate(); } } @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { return new LayoutParams(getContext(), attrs); } @Override protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { return p instanceof LayoutParams; } @Override protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { return new LayoutParams(p); } public static class LayoutParams extends FrameLayout.LayoutParams { public int offsetX = 0; public int offsetY = 0; public boolean hide = false; public LayoutParams(Context c, AttributeSet attrs) { super(c, attrs); } public LayoutParams(int width, int height) { super(width, height); } public LayoutParams(int width, int height, int gravity) { super(width, height, gravity); } public LayoutParams(ViewGroup.LayoutParams source) { super(source); } public LayoutParams(MarginLayoutParams source) { super(source); } } }