81 lines
3.0 KiB
Markdown
81 lines
3.0 KiB
Markdown
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# NoSpinbox
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- **功能描述：** 使数值属性禁止默认的拖放和滚轮的UI编辑功能，数值属性包括int系列以及float系列。
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- **使用位置：** UPROPERTY
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- **引擎模块：** Numeric Property
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- **元数据类型：** bool
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- **限制类型：** Numeric Type, int / float
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- **常用程度：** ★★
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使数值属性禁止默认的拖放和滚轮的UI编辑功能，数值属性包括int系列以及float系列。
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## 测试代码：
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```cpp
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public:
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UPROPERTY(EditAnywhere, BlueprintReadWrite,Category=SpinBoxTest)
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int32 MyInt = 123;
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UPROPERTY(EditAnywhere, BlueprintReadWrite,Category=SpinBoxTest, meta = (NoSpinbox = true))
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int32 MyInt_NoSpinbox = 123;
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UPROPERTY(EditAnywhere, BlueprintReadWrite,Category=SpinBoxTest)
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float MyFloat = 123;
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UPROPERTY(EditAnywhere, BlueprintReadWrite,Category=SpinBoxTest, meta = (NoSpinbox = true))
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float MyFloat_NoSpinbox = 123;
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```
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## 测试效果：
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发现带有NoSpinbox 的属性不能用鼠标左右拖动改变数值，也不能用鼠标滚轮改变数值。
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## 原理：
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可以看到针对数值的UI，bAllowSpin的功能直接决定了Widget的AllowWheel和AllowSpin功能。
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```cpp
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virtual TSharedRef<SWidget> GetDefaultValueWidget() override
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{
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const typename TNumericPropertyParams<NumericType>::FMetaDataGetter MetaDataGetter = TNumericPropertyParams<NumericType>::FMetaDataGetter::CreateLambda([&](const FName& Key)
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{
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return (PinProperty) ? PinProperty->GetMetaData(Key) : FString();
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});
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TNumericPropertyParams<NumericType> NumericPropertyParams(PinProperty, PinProperty ? MetaDataGetter : nullptr);
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const bool bAllowSpin = !(PinProperty && PinProperty->GetBoolMetaData("NoSpinbox"));
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// Save last committed value to compare when value changes
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LastSliderCommittedValue = GetNumericValue().GetValue();
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return SNew(SBox)
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.MinDesiredWidth(MinDesiredBoxWidth)
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.MaxDesiredWidth(400)
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[
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SNew(SNumericEntryBox<NumericType>)
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.EditableTextBoxStyle(FAppStyle::Get(), "Graph.EditableTextBox")
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.BorderForegroundColor(FSlateColor::UseForeground())
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.Visibility(this, &SGraphPinNumSlider::GetDefaultValueVisibility)
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.IsEnabled(this, &SGraphPinNumSlider::GetDefaultValueIsEditable)
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.Value(this, &SGraphPinNumSlider::GetNumericValue)
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.MinValue(NumericPropertyParams.MinValue)
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.MaxValue(NumericPropertyParams.MaxValue)
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.MinSliderValue(NumericPropertyParams.MinSliderValue)
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.MaxSliderValue(NumericPropertyParams.MaxSliderValue)
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.SliderExponent(NumericPropertyParams.SliderExponent)
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.Delta(NumericPropertyParams.Delta)
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.LinearDeltaSensitivity(NumericPropertyParams.GetLinearDeltaSensitivityAttribute())
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.AllowWheel(bAllowSpin)
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.WheelStep(NumericPropertyParams.WheelStep)
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.AllowSpin(bAllowSpin)
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.OnValueCommitted(this, &SGraphPinNumSlider::OnValueCommitted)
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.OnValueChanged(this, &SGraphPinNumSlider::OnValueChanged)
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.OnBeginSliderMovement(this, &SGraphPinNumSlider::OnBeginSliderMovement)
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.OnEndSliderMovement(this, &SGraphPinNumSlider::OnEndSliderMovement)
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];
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}
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```
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