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[iOS] Use same font size for Editor/Entry placeholders #13140

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merged 3 commits into from
Feb 6, 2023
Merged

[iOS] Use same font size for Editor/Entry placeholders #13140

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129a47a
[iOS] Use same font size for placeholder
rmarinho Feb 6, 2023
44b5c1a
[iOS] Update placeholder fontsize when UITextView Font is updated
rmarinho Feb 6, 2023
25e8955
Fix getting _defaultPlaceholderSize only 1 time
rmarinho Feb 6, 2023
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28 changes: 28 additions & 0 deletions src/Core/src/Platform/iOS/MauiTextView.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ namespace Microsoft.Maui.Platform
public class MauiTextView : UITextView
{
readonly UILabel _placeholderLabel;
nfloat _defaultPlaceholderSize = -1;

public MauiTextView()
{
Expand Down Expand Up @@ -80,6 +81,17 @@ public override string? Text
}
}

public override UIFont? Font
{
get => base.Font;
set
{
base.Font = value;
UpdatePlaceholderFontSize(value);

}
}

public override NSAttributedString AttributedText
{
get => base.AttributedText;
Expand Down Expand Up @@ -161,5 +173,21 @@ void ShouldCenterVertically()
_ => new CGPoint(0, 0),
};
}

void UpdatePlaceholderFontSize(UIFont? value)
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{
if (value != null)
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is not is preferred over != because operator can be overridden leading to possible bugs.

Suggested change
if (value != null)
if (value is not null)

{
if (_defaultPlaceholderSize == -1)
{
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(value.PointSize);
}
else if (_defaultPlaceholderSize != -1)
{
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(_defaultPlaceholderSize);
}
}
Comment on lines +177 to +191
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@mandel-macaque mandel-macaque Feb 7, 2023 •
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I don't quite understand the logic, lets walk through it, first invert the if, that results in the following:

Suggested change
void UpdatePlaceholderFontSize(UIFont? value)
{
if (value != null)
{
if (_defaultPlaceholderSize == -1)
{
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(value.PointSize);
}
else if (_defaultPlaceholderSize != -1)
{
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(_defaultPlaceholderSize);
}
}
void UpdatePlaceholderFontSize(UIFont? value)
{
if (value is null) {
if (_defaultPlaceholderSize != -1)
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (_defaultPlaceholderSize);
}
else {
if (_defaultPlaceholderSize == -1) {
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (value.PointSize);
}
}

Same behaviour, of course if we have a nested if with no else, that equals a && so we have:

Suggested change
void UpdatePlaceholderFontSize(UIFont? value)
{
if (value != null)
{
if (_defaultPlaceholderSize == -1)
{
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(value.PointSize);
}
else if (_defaultPlaceholderSize != -1)
{
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(_defaultPlaceholderSize);
}
}
void UpdatePlaceholderFontSize(UIFont? value)
{
if (value is null && _defaultPlaceholderSize != -1) {
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (_defaultPlaceholderSize);
}
else {
if (_defaultPlaceholderSize == -1) {
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (value.PointSize);
}
}

We can now move to the else clause, which is the one that confuses me, looks like you want to set _defaultPlaceholderSize to the size of the _placeholderLabel.Font.PointSize only when it is -1. By the look of the code _defaultPlaceholderSize is never modified by any other value, so why not moving that if outside the else clause?

Suggested change
void UpdatePlaceholderFontSize(UIFont? value)
{
if (value != null)
{
if (_defaultPlaceholderSize == -1)
{
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(value.PointSize);
}
else if (_defaultPlaceholderSize != -1)
{
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(_defaultPlaceholderSize);
}
}
void UpdatePlaceholderFontSize(UIFont? value)
{
if (_defaultPlaceholderSize == -1) {
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
if (value is null && _defaultPlaceholderSize != -1) {
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (_defaultPlaceholderSize);
}
else {
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (value.PointSize);
}
}

No a huge fan of a read-write variable accessible by the rest of the code to hold the default value and be updated the first time a property is used. Maybe using https://learn.microsoft.com/en-us/dotnet/api/system.lazy-1?view=net-7.0 is a better approach, but I let you judge. Nevertheless the code is cleaner this way, or at least with the first iteration.

I believe you can make it a lot nicer if you use a nullable value, rather than _defaultPlaceholderSize = -1 make it a nfloat? which is much safer, we know we started with null, if not null someone changed it:

Suggested change
void UpdatePlaceholderFontSize(UIFont? value)
{
if (value != null)
{
if (_defaultPlaceholderSize == -1)
{
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(value.PointSize);
}
else if (_defaultPlaceholderSize != -1)
{
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(_defaultPlaceholderSize);
}
}
void UpdatePlaceholderFontSize(UIFont? value)
{
if (_defaultPlaceholderSize is null) {
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
if (value is null && _defaultPlaceholderSize is not null) {
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (_defaultPlaceholderSize);
}
else {
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (value.PointSize);
}
}

You can make it even smaller using a ternary operator:

Suggested change
void UpdatePlaceholderFontSize(UIFont? value)
{
if (value != null)
{
if (_defaultPlaceholderSize == -1)
{
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(value.PointSize);
}
else if (_defaultPlaceholderSize != -1)
{
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(_defaultPlaceholderSize);
}
}
void UpdatePlaceholderFontSize(UIFont? value)
{
if (_defaultPlaceholderSize is null) {
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (
value is null && _defaultPlaceholderSize is not null ? _defaultPlaceholderSize.Value : value.PointSize);
}
}

The last implementation can be improved by removing the is not for the _defaultPlaceholderSize since we know it was set already:

Suggested change
void UpdatePlaceholderFontSize(UIFont? value)
{
if (value != null)
{
if (_defaultPlaceholderSize == -1)
{
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(value.PointSize);
}
else if (_defaultPlaceholderSize != -1)
{
_placeholderLabel.Font = _placeholderLabel.Font.WithSize(_defaultPlaceholderSize);
}
}
void UpdatePlaceholderFontSize(UIFont? value)
{
if (_defaultPlaceholderSize is null) {
_defaultPlaceholderSize = _placeholderLabel.Font.PointSize;
}
_placeholderLabel.Font = _placeholderLabel.Font.WithSize (
value is null ? _defaultPlaceholderSize.Value : value.PointSize);
}
}

The last suggestion seems the cleaner one. But do as you wish :)

}
}
2 changes: 2 additions & 0 deletions src/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
#nullable enable
override Microsoft.Maui.Handlers.SwitchHandler.NeedsContainer.get -> bool
override Microsoft.Maui.Platform.MauiTextView.Font.get -> UIKit.UIFont?
override Microsoft.Maui.Platform.MauiTextView.Font.set -> void
static Microsoft.Maui.Layouts.LayoutExtensions.ArrangeContentUnbounded(this Microsoft.Maui.IContentView! contentView, Microsoft.Maui.Graphics.Rect bounds) -> Microsoft.Maui.Graphics.Size
override Microsoft.Maui.Platform.MauiTextField.WillMoveToWindow(UIKit.UIWindow? window) -> void
override Microsoft.Maui.Platform.MauiTextView.WillMoveToWindow(UIKit.UIWindow? window) -> void
Expand Down
2 changes: 2 additions & 0 deletions src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
#nullable enable
override Microsoft.Maui.Handlers.SwitchHandler.NeedsContainer.get -> bool
override Microsoft.Maui.Platform.MauiTextView.Font.get -> UIKit.UIFont?
override Microsoft.Maui.Platform.MauiTextView.Font.set -> void
static Microsoft.Maui.Layouts.LayoutExtensions.ArrangeContentUnbounded(this Microsoft.Maui.IContentView! contentView, Microsoft.Maui.Graphics.Rect bounds) -> Microsoft.Maui.Graphics.Size
override Microsoft.Maui.Platform.MauiTextField.WillMoveToWindow(UIKit.UIWindow? window) -> void
override Microsoft.Maui.Platform.MauiTextView.WillMoveToWindow(UIKit.UIWindow? window) -> void
Expand Down
20 changes: 20 additions & 0 deletions src/Core/tests/DeviceTests/Handlers/Editor/EditorHandlerTests.iOS.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,26 @@ namespace Microsoft.Maui.DeviceTests
{
public partial class EditorHandlerTests
{
#if IOS
[Fact(DisplayName = "Placeholder Size is the same as control")]
public async Task PlaceholderFontHasTheSameSize()
{
var sizeFont = 22;
var editor = new EditorStub()
{
Text = "Text",
Font = Font.SystemFontOfSize(sizeFont)
};

var nativePlaceholderSize = await GetValueAsync(editor, handler =>
{
return GetNativePlaceholder(handler).Font.PointSize;
});

Assert.True(nativePlaceholderSize == sizeFont);
}
#endif

[Fact(DisplayName = "Placeholder Toggles Correctly When Text Changes")]
public async Task PlaceholderTogglesCorrectlyWhenTextChanges()
{
Expand Down