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View: prevent redundant measuring for performance reasons

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No need to remeasure or relayout when nothing has changed
This commit is contained in:
Julian Winkler
2023-10-28 22:38:43 +02:00
parent 4f9e672819
commit 3bdffe7ce9
4 changed files with 28 additions and 14 deletions
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26
src/api-impl/android/view/View.java
View File

@@ -806,6 +806,12 @@ public class View extends Object {
public static HashMap<Integer, View> view_by_id = new HashMap<Integer, View>();
private int oldWidthMeasureSpec;
private int oldHeightMeasureSpec;
private boolean layoutRequested;
private int oldWidth;
private int oldHeight;
public View() {
this(Context.this_application);
} // FIXME
@@ -1081,7 +1087,12 @@ public class View extends Object {
public void setOnHoverListener(OnHoverListener listener) {}
public final void measure(int widthMeasureSpec, int heightMeasureSpec) {
onMeasure(widthMeasureSpec, heightMeasureSpec);
if (layoutRequested || widthMeasureSpec != oldWidthMeasureSpec || heightMeasureSpec != oldHeightMeasureSpec) {
oldWidthMeasureSpec = widthMeasureSpec;
oldHeightMeasureSpec = heightMeasureSpec;
onMeasure(widthMeasureSpec, heightMeasureSpec);
layoutRequested = false;
}
}
public final int getMeasuredState() {
@@ -1156,6 +1167,18 @@ public class View extends Object {
native_layout(widget, l, t, r, b);
}
/** Helper function to be called from GTKs LayoutManager via JNI */
private void layoutInternal(int width, int height) {
// if the layout is triggered from a native widget, we might not have measured yet
if (width != getMeasuredWidth() || height != getMeasuredHeight()) {
measure(width | MeasureSpec.EXACTLY, height | MeasureSpec.EXACTLY);
}
boolean changed = oldWidth != width || oldHeight != height;
onLayout(changed, 0, 0, width, height);
oldWidth = width;
oldHeight = height;
}
public int getLeft() {
return left;
}
@@ -1190,6 +1213,7 @@ public class View extends Object {
public boolean removeCallbacks(Runnable action) {return false;}
public void requestLayout() {
layoutRequested = true;
native_requestLayout(widget);
};