Chromium HTML5 新的 Input 类型number对应c++

时间：2024-10-28 15:15:05

一、Input 类型: number

number 类型用于应该包含数值的输入域。

您还能够设定对所接受的数字的限定：

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>test</title> 
</head>
<body>

<form action="demo-form.php">
  数量 ( 1 到 5 之间): <input type="number" name="quantity" min="1" max="5">
  <input type="submit">
</form>

<p><b>注意:</b>Internet Explorer 9 及更早 IE 版本不支持 type="number" 。</p>

</body>
</html>

二、c++定义：

third_party\blink\renderer\core\html\forms\number_input_type.h

third_party\blink\renderer\core\html\forms\number_input_type.cc

namespace blink {

class ExceptionState;

class NumberInputType final : public TextFieldInputType {
 public:
  explicit NumberInputType(HTMLInputElement& element)
      : TextFieldInputType(Type::kNumber, element) {}
  bool TypeMismatchFor(const String&) const;

 private:
  void CountUsage() override;
  void SetValue(const String&,
                bool value_changed,
                TextFieldEventBehavior,
                TextControlSetValueSelection) override;
  double ValueAsDouble() const override;
  void SetValueAsDouble(double,
                        TextFieldEventBehavior,
                        ExceptionState&) const override;
  void SetValueAsDecimal(const Decimal&,
                         TextFieldEventBehavior,
                         ExceptionState&) const override;
  bool TypeMismatch() const override;
  bool SizeShouldIncludeDecoration(int default_size,
                                   int& preferred_size) const override;
  StepRange CreateStepRange(AnyStepHandling) const override;
  void HandleKeydownEvent(KeyboardEvent&) override;
  void HandleBeforeTextInsertedEvent(BeforeTextInsertedEvent&) override;
  Decimal ParseToNumber(const String&, const Decimal&) const override;
  String Serialize(const Decimal&) const override;
  String LocalizeValue(const String&) const override;
  String VisibleValue() const override;
  String ConvertFromVisibleValue(const String&) const override;
  String SanitizeValue(const String&) const override;
  void WarnIfValueIsInvalid(const String&) const override;
  bool HasBadInput() const override;
  String BadInputText() const override;
  String ValueNotEqualText(const Decimal& value) const override;
  String RangeOverflowText(const Decimal& maxmum) const override;
  String RangeUnderflowText(const Decimal& minimum) const override;
  String RangeInvalidText(const Decimal& minimum,
                          const Decimal& maximum) const override;
  bool SupportsPlaceholder() const override;
  void MinOrMaxAttributeChanged() override;
  void StepAttributeChanged() override;
  bool SupportsSelectionAPI() const override;
};

template <>
struct DowncastTraits<NumberInputType> {
  static bool AllowFrom(const InputType& type) {
    return type.IsNumberInputType();
  }
};

}  // namespace blink

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