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Fix ContentView Width property not available to children in Android CollectionView #18

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Fix ContentView Width property not available to children in Android CollectionView #18

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55b08c4
Initial plan
Copilot Jul 11, 2025
9a64379
Fix ContentView Width property not available to children in Android C…
Copilot Jul 11, 2025
d7343f5
Add test for ContentView Width availability to child elements during …
Copilot Jul 11, 2025
51a1d77
Fix ContentView Width availability during CollectionView scrolling sc…
Copilot Jul 11, 2025
d0f54ab
Move ContentView Width fix to CollectionView-specific ItemContentView
Copilot Jul 14, 2025
4606b44
Fix child element measurement timing by updating ContentView Frame be…
Copilot Jul 14, 2025
12b684d
Address hierarchical structure issue by applying fix to all View type…
Copilot Jul 14, 2025
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25 changes: 25 additions & 0 deletions src/Controls/src/Core/Handlers/Items/Android/ItemContentView.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,19 @@ protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
handler.LayoutVirtualView(l, t, r, b);
}

// Ensure the ContentView's Frame is updated with the final layout bounds
// This is especially important during scrolling scenarios in CollectionView
if (View is ContentView contentView)
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@SuthiYuvaraj SuthiYuvaraj Jul 14, 2025

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This issue isn't specific to ContentView — it's caused by the hierarchical structure of the item templates. CollectionView does not measure all the nested elements within each item, which leads to incorrect sizing or layout behavior.

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Copilot AI Jul 14, 2025

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You're absolutely right. I've updated the fix to address the broader hierarchical structure issue rather than targeting just ContentView. The fix now ensures that any View in the item template hierarchy has its Frame properly updated before child measurements, addressing the root cause where CollectionView doesn't properly measure all nested elements. Commit 7a36e18 makes this change.

{
var currentFrame = contentView.Frame;
var newFrame = new Graphics.Rect(this.FromPixels(l), this.FromPixels(t),
this.FromPixels(r - l), this.FromPixels(b - t));
if (currentFrame != newFrame)
{
contentView.Frame = newFrame;
}
}
}

protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
Expand Down Expand Up @@ -204,6 +217,18 @@ _pixelSize is not null &&

ReportMeasure?.Invoke(new Size(pixelWidth, pixelHeight));

// Update the ContentView's Frame so that Width and Height properties are available
// to child elements during layout calculations in CollectionView scenarios
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@SuthiYuvaraj SuthiYuvaraj Jul 14, 2025

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Still we are not properly measuring the inner child

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Copilot AI Jul 14, 2025

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Fixed the child measurement timing issue by moving the ContentView Frame update to happen BEFORE the View.Measure() call instead of after. This ensures child elements have access to their parent's Width and Height properties during their own measure calculations. Commit ba5d0ac addresses this.

if (View is ContentView contentView)
{
var currentFrame = contentView.Frame;
var newFrame = new Graphics.Rect(currentFrame.X, currentFrame.Y, width, height);
if (currentFrame != newFrame)
{
contentView.Frame = newFrame;
}
}

SetMeasuredDimension(pixelWidth, pixelHeight);
}

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25 changes: 0 additions & 25 deletions src/Core/src/Platform/Android/ContentViewGroup.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -84,18 +84,6 @@ protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
platformWidth = Math.Max(MinimumWidth, platformWidth);
platformHeight = Math.Max(MinimumHeight, platformHeight);

// Update the ContentView's Frame so that Width and Height properties are available
// to child elements during layout calculations, especially in CollectionView scenarios
if (CrossPlatformLayout is IView contentView)
{
var currentFrame = contentView.Frame;
var newFrame = new Graphics.Rect(currentFrame.X, currentFrame.Y, width, height);
if (currentFrame != newFrame)
{
contentView.Frame = newFrame;
}
}

SetMeasuredDimension((int)platformWidth, (int)platformHeight);
}

Expand All @@ -109,19 +97,6 @@ protected override void OnLayout(bool changed, int left, int top, int right, int
var destination = _context.ToCrossPlatformRectInReferenceFrame(left, top, right, bottom);

CrossPlatformArrange(destination);

// Ensure the ContentView's Frame is updated with the final layout bounds
// This is especially important during scrolling scenarios where the Frame
// might be reset or updated after the measure pass
if (CrossPlatformLayout is IView contentView)
{
var currentFrame = contentView.Frame;
var newFrame = destination;
if (currentFrame != newFrame)
{
contentView.Frame = newFrame;
}
}
}

internal IBorderStroke? Clip
Expand Down