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# Conflicts: # examples/src/main/java/com/alibaba/android/vlayout/example/VLayoutActivity.java # vlayout/src/main/java/com/alibaba/android/vlayout/VirtualLayoutManager.java
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142 changes: 142 additions & 0 deletions
142
vlayout/src/main/java/com/alibaba/android/vlayout/extend/ViewLifeCycleHelper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| package com.alibaba.android.vlayout.extend; | ||
|
|
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| import android.support.annotation.NonNull; | ||
| import android.support.v4.util.ArrayMap; | ||
| import android.view.View; | ||
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| import com.alibaba.android.vlayout.VirtualLayoutManager; | ||
|
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| public class ViewLifeCycleHelper { | ||
| public enum STATUS { | ||
| APPEARING, | ||
| APPEARED, | ||
| DISAPPEARING, | ||
| DISAPPEARED | ||
| } | ||
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| private ArrayMap<View, STATUS> mViewStatusMap = new ArrayMap<>(); | ||
|
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| private ViewLifeCycleListener mViewLifeCycleListener; | ||
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| private VirtualLayoutManager mVirtualLayoutManager; | ||
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| private int scrHeight; | ||
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| public ViewLifeCycleHelper(VirtualLayoutManager virtualLayoutManager, @NonNull ViewLifeCycleListener mViewLifeCycleListener) { | ||
| this.mViewLifeCycleListener = mViewLifeCycleListener; | ||
| this.mVirtualLayoutManager = virtualLayoutManager; | ||
| } | ||
|
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| public void checkViewStatusInScreen() { | ||
| for (int i = 0; i < mVirtualLayoutManager.getChildCount(); i++) { | ||
| View view = mVirtualLayoutManager.getChildAt(i); | ||
| if (scrHeight == 0) { | ||
| scrHeight = view.getContext().getResources().getDisplayMetrics().heightPixels; | ||
| } | ||
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| if (mVirtualLayoutManager.getVirtualLayoutDirection() == VirtualLayoutManager.LayoutState.LAYOUT_END) { | ||
| if (view.getTop() <= 0 && view.getBottom() >= 0 && isViewReadyDisAppearing(view)) { | ||
| setViewDisappearing(view); | ||
| } else if (view.getTop() <= scrHeight && view.getBottom() >= scrHeight && isViewReadyAppearing(view)) { | ||
| setViewAppearing(view); | ||
| } | ||
| } else { | ||
| if (view.getTop() <= 0 && view.getBottom() >= 0 && isViewReadyAppearing(view)) { | ||
| setViewAppearing(view); | ||
| } else if (view.getTop() <= scrHeight && view.getBottom() >= scrHeight && isViewReadyDisAppearing(view)) { | ||
| setViewDisappearing(view); | ||
| } | ||
| } | ||
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| if (view.getTop() >= 0 && view.getBottom() <= scrHeight) { | ||
| // fully in screen | ||
|
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| if (isViewReadyAppearing(view)) { | ||
| setViewAppearing(view); | ||
|
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| } else if (isViewReadyAppeared(view)) { | ||
| setViewAppeared(view); | ||
| } | ||
| } else if (view.getBottom() <= 0 || view.getTop() >= scrHeight) { | ||
| // not in screen | ||
| if (isViewReadyDisAppearing(view)) { | ||
| setViewDisappearing(view); | ||
|
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| } else if (isViewReadyDisAppeared(view)) { | ||
| setViewDisappeared(view); | ||
| } | ||
|
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| } | ||
| } | ||
| } | ||
|
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| private STATUS getViewStatus(View view) { | ||
| if (!mViewStatusMap.containsKey(view)) { | ||
| mViewStatusMap.put(view, STATUS.DISAPPEARED); | ||
| return STATUS.DISAPPEARED; | ||
| } | ||
| return mViewStatusMap.get(view); | ||
| } | ||
|
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| private void setViewstatus(View view, STATUS status) { | ||
| mViewStatusMap.put(view, status); | ||
| } | ||
|
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| private boolean isViewReadyAppearing(View view) { | ||
| return getViewStatus(view) == STATUS.DISAPPEARED; | ||
| } | ||
|
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| private void setViewAppearing(View view) { | ||
| if (getViewStatus(view) == STATUS.APPEARING) { | ||
| return; | ||
| } | ||
|
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| setViewstatus(view, STATUS.APPEARING); | ||
| if (null != mViewLifeCycleListener) { | ||
| mViewLifeCycleListener.onAppearing(view); | ||
| } | ||
| } | ||
|
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| private boolean isViewReadyAppeared(View view) { | ||
| return getViewStatus(view) == STATUS.APPEARING; | ||
| } | ||
|
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| private void setViewAppeared(View view) { | ||
| if (getViewStatus(view) == STATUS.APPEARED) { | ||
| return; | ||
| } | ||
| setViewstatus(view, STATUS.APPEARED); | ||
| if (null != mViewLifeCycleListener) { | ||
| mViewLifeCycleListener.onAppeared(view); | ||
| } | ||
| } | ||
|
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| private boolean isViewReadyDisAppearing(View view) { | ||
| return getViewStatus(view) == STATUS.APPEARED; | ||
| } | ||
|
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| private void setViewDisappearing(View view) { | ||
| if (getViewStatus(view) == STATUS.DISAPPEARING) { | ||
| return; | ||
| } | ||
|
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| setViewstatus(view, STATUS.DISAPPEARING); | ||
| if (null != mViewLifeCycleListener) { | ||
| mViewLifeCycleListener.onDisappearing(view); | ||
| } | ||
| } | ||
|
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| private boolean isViewReadyDisAppeared(View view) { | ||
| return getViewStatus(view) == STATUS.DISAPPEARING; | ||
| } | ||
|
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| private void setViewDisappeared(View view) { | ||
| if (getViewStatus(view) == STATUS.DISAPPEARED) { | ||
| return; | ||
| } | ||
| setViewstatus(view, STATUS.DISAPPEARED); | ||
| if (null != mViewLifeCycleListener) { | ||
| mViewLifeCycleListener.onDisappeared(view); | ||
| } | ||
| } | ||
| } |
13 changes: 13 additions & 0 deletions
13
vlayout/src/main/java/com/alibaba/android/vlayout/extend/ViewLifeCycleListener.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| package com.alibaba.android.vlayout.extend; | ||
|
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| import android.view.View; | ||
|
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| public interface ViewLifeCycleListener { | ||
| void onAppearing(View view); | ||
|
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| void onDisappearing(View view); | ||
|
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| void onAppeared(View view); | ||
|
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| void onDisappeared(View view); | ||
| } |
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