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Apply better coordinatorlayout animation and RTL support.
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.../thoughtcrime/securesms/groups/ui/creategroup/GroupSettingsCoordinatorLayoutBehavior.java
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package org.thoughtcrime.securesms.groups.ui.creategroup; | ||
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import android.content.Context; | ||
import android.graphics.Rect; | ||
import android.util.AttributeSet; | ||
import android.view.View; | ||
import android.view.animation.DecelerateInterpolator; | ||
import android.view.animation.Interpolator; | ||
import android.widget.TextView; | ||
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import androidx.annotation.IdRes; | ||
import androidx.annotation.NonNull; | ||
import androidx.annotation.Nullable; | ||
import androidx.coordinatorlayout.widget.CoordinatorLayout; | ||
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import com.google.android.material.appbar.AppBarLayout; | ||
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import org.thoughtcrime.securesms.R; | ||
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import java.lang.ref.WeakReference; | ||
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public final class GroupSettingsCoordinatorLayoutBehavior extends CoordinatorLayout.Behavior<View> { | ||
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private static final Interpolator INTERPOLATOR = new DecelerateInterpolator(); | ||
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private final ViewRef avatarTargetRef = new ViewRef(R.id.avatar_target); | ||
private final ViewRef groupNameRef = new ViewRef(R.id.group_name); | ||
private final ViewRef groupNameTargetRef = new ViewRef(R.id.group_name_target); | ||
private final Rect targetRect = new Rect(); | ||
private final Rect childRect = new Rect(); | ||
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public GroupSettingsCoordinatorLayoutBehavior(@NonNull Context context, @Nullable AttributeSet attrs) { | ||
} | ||
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@Override | ||
public boolean layoutDependsOn(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency) { | ||
return dependency instanceof AppBarLayout; | ||
} | ||
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@Override | ||
public boolean onDependentViewChanged(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency) { | ||
AppBarLayout appBarLayout = (AppBarLayout) dependency; | ||
int range = appBarLayout.getTotalScrollRange(); | ||
float factor = INTERPOLATOR.getInterpolation(-appBarLayout.getY() / range); | ||
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updateAvatarPositionAndScale(parent, child, factor); | ||
updateNamePosition(parent, factor); | ||
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return true; | ||
} | ||
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private void updateAvatarPositionAndScale(@NonNull CoordinatorLayout parent, @NonNull View child, float factor) { | ||
View target = avatarTargetRef.require(parent); | ||
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targetRect.set(target.getLeft(), target.getTop(), target.getRight(), target.getBottom()); | ||
childRect.set(child.getLeft(), child.getTop(), child.getRight(), child.getBottom()); | ||
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float widthScale = 1f - (1f - (targetRect.width() / (float) childRect.width())) * factor; | ||
float heightScale = 1f - (1f - (targetRect.height() / (float) childRect.height())) * factor; | ||
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float superimposedLeft = childRect.left + (childRect.width() - targetRect.width()) / 2f; | ||
float superimposedTop = childRect.top + (childRect.height() - targetRect.height()) / 2f; | ||
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float xTranslation = (targetRect.left - superimposedLeft) * factor; | ||
float yTranslation = (targetRect.top - superimposedTop) * factor; | ||
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child.setScaleX(widthScale); | ||
child.setScaleY(heightScale); | ||
child.setTranslationX(xTranslation); | ||
child.setTranslationY(yTranslation); | ||
} | ||
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private void updateNamePosition(@NonNull CoordinatorLayout parent, float factor) { | ||
TextView child = (TextView) groupNameRef.require(parent); | ||
View target = groupNameTargetRef.require(parent); | ||
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targetRect.set(target.getLeft(), target.getTop(), target.getRight(), target.getBottom()); | ||
childRect.set(child.getLeft(), child.getTop(), child.getRight(), child.getBottom()); | ||
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if (child.getMaxWidth() != targetRect.width()) { | ||
child.setMaxWidth(targetRect.width()); | ||
} | ||
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float deltaTop = targetRect.top - childRect.top; | ||
float deltaStart = getStart(parent, targetRect) - getStart(parent, childRect); | ||
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float yTranslation = deltaTop * factor; | ||
float xTranslation = deltaStart * factor; | ||
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child.setTranslationY(yTranslation); | ||
child.setTranslationX(xTranslation); | ||
} | ||
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private static int getStart(@NonNull CoordinatorLayout parent, @NonNull Rect rect) { | ||
return parent.getLayoutDirection() == View.LAYOUT_DIRECTION_LTR ? rect.left : rect.right; | ||
} | ||
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private static final class ViewRef { | ||
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private WeakReference<View> ref = new WeakReference<>(null); | ||
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private final @IdRes int idRes; | ||
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private ViewRef(@IdRes int idRes) { | ||
this.idRes = idRes; | ||
} | ||
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private @NonNull View require(@NonNull View parent) { | ||
View view = ref.get(); | ||
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if (view == null) { | ||
view = getChildOrThrow(parent, idRes); | ||
ref = new WeakReference<>(view); | ||
} | ||
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return view; | ||
} | ||
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private static @NonNull View getChildOrThrow(@NonNull View parent, @IdRes int id) { | ||
View child = parent.findViewById(id); | ||
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if (child == null) { | ||
throw new AssertionError("Can't find view with ID " + R.id.avatar_target); | ||
} else { | ||
return child; | ||
} | ||
} | ||
} | ||
} |
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