从DropdownButtonFormField2中移除默认填充并调整宽度。

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英文:

Remove default padding from DropdownButtonFormField2 and resize the width

问题

以下是翻译好的部分:

  1. 我想要下拉列表的宽度与上面的容器宽度相等。正如您在我提供的示例中所看到的,它们不相等,看起来很糟糕。
  2. 目前下拉选项中有太多的填充。我需要将所有内容压缩到最小填充,以便我可以指定我想要的填充。

这是我的Dropdown FormField的代码,以及屏幕截图。

谢谢!

英文:

I have this dropdown list and I want a few things changed, but have no clue how to do so.

  1. I want the width of the dropdown to equal the width of the container above. As you can see in the example I provided above, it is not equal and that looks really bad.
  2. There is way too much padding in the dropdown options right now. I need everything to be compressed to minimum padding so I can specify the padding I want

Here is my code for the Dropdown FormField, and here is a screenshot

Thanks!

                Container(
                  width: size.width * .9,
                  child: DropdownButtonFormField2(
                    decoration: InputDecoration(
                      border: UnderlineInputBorder(),
                      labelText: 'Muscle',
                      filled: true,
                      isDense: true,
                      fillColor: Colors.white24,
                      hintStyle: TextStyle(color: Colors.green),
                      focusedBorder: UnderlineInputBorder(
                        borderSide: BorderSide(color: Colors.white),
                      ),
                    ),
                    style: TextStyle(color: Colors.black),
                    value: selectedMuscleGroup,
                    onChanged: (String? newValue) {
                      setState(() {
                        selectedMuscleGroup = newValue;
                      });
                    },
                    items: <String>[
                      'Biceps',
                      'Triceps',
                      'Chest',
                      'Back',
                      'Legs',
                      'Shoulders'
                    ].map<DropdownMenuItem<String>>((String value) {
                      return DropdownMenuItem<String>(
                        value: value,
                        child: Container(
                            padding: EdgeInsets.zero, child: Text(value)),
                      );
                    }).toList(),
                  ),
                ),

Thank you so much in advance!!

答案1

得分: 1

DropdownButtonFormField2 提供了灵活的选项来自定义。

管理填充:
可以通过 dropdownStyleData 设置整体的 dropdownPadding
可以通过 menuItemStyleData 设置特定菜单的填充。

控制宽度:
dropdownStyleData 中有 width 属性和 offset 用于设置下拉填充的整体宽度和位置。

为标签添加填充: 使用 label 属性

为当前选定的值(按钮)添加填充: 使用 buttonStyleData

例如,在你的情况下,代码如下:

Container(
      color: Colors.white,
      width: 250,
      child: DropdownButtonFormField2(
        decoration: const InputDecoration(
          border: UnderlineInputBorder(),
          /// 用于管理标签填充
          label: Padding(
            padding: EdgeInsets.all(8.0),
            child: Text('Muscle'),
          ),
          hintStyle: TextStyle(color: Colors.green),
          focusedBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: Colors.white),
          ),
        ),
        /// 用于管理选定值填充
        buttonStyleData: const ButtonStyleData(
          height: 50,
          padding: EdgeInsets.only(left: 8.0, top: 8.0)
        ),
        style: const TextStyle(color: Colors.black),
        dropdownStyleData: const DropdownStyleData(
          width: 250.0,
          padding: EdgeInsets.all(0.0)
        ),
        menuItemStyleData: const MenuItemStyleData(
          padding: EdgeInsets.all(0.0),
          height: 36.0,
        ),
        value: selectedMuscleGroup,
        onChanged: (String? newValue) {
          setState(() {
            selectedMuscleGroup = newValue;
          });
        },
        items: <String>['Biceps', 'Triceps', 'Chest', 'Back', 'Legs', 'Shoulders']
            .map<DropdownMenuItem<String>>((String value) {
          return DropdownMenuItem<String>(
            value: value,
            child: Text(value),
          );
        }).toList(),
      ),
    );

输出:

从DropdownButtonFormField2中移除默认填充并调整宽度。

英文:

DropdownButtonFormField2 provides flexible options to customize.

To Manage Padding:
Overall dropdownPadding can be set via dropdownStyleData and
Specific menu padding can be set via menuItemStyleData

To Control Width:
There is width property and offset to set overall width of dropdown padding and its position in dropdownStyleData.

For Adding Padding to label: Use label property

To Add padding to Current selected value (button): Use buttonStyleData

Example for your case,

Code:

Container(
      color: Colors.white,
      width: 250,
      child: DropdownButtonFormField2(
        decoration: const InputDecoration(
          border: UnderlineInputBorder(),
          /// For Managing Label Padding
          label: Padding(
            padding: EdgeInsets.all(8.0),
            child: Text(&#39;Muscle&#39;),
          ),
          hintStyle: TextStyle(color: Colors.green),
          focusedBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: Colors.white),
          ),
        ),
        /// For Managing Select Value Padding
        buttonStyleData: const ButtonStyleData(
          height: 50,
          padding: EdgeInsets.only(left: 8.0, top: 8.0)
        ),
        style: const TextStyle(color: Colors.black),
        dropdownStyleData: const DropdownStyleData(
          width: 250.0,
          padding: EdgeInsets.all(0.0)
        ),
        menuItemStyleData: const MenuItemStyleData(
          padding: EdgeInsets.all(0.0),
          height: 36.0,
        ),
        value: selectedMuscleGroup,
        onChanged: (String? newValue) {
          setState(() {
            selectedMuscleGroup = newValue;
          });
        },
        items: &lt;String&gt;[&#39;Biceps&#39;, &#39;Triceps&#39;, &#39;Chest&#39;, &#39;Back&#39;, &#39;Legs&#39;, &#39;Shoulders&#39;]
            .map&lt;DropdownMenuItem&lt;String&gt;&gt;((String value) {
          return DropdownMenuItem&lt;String&gt;(
            value: value,
            child: Text(value),
          );
        }).toList(),
      ),
    );

Output:

从DropdownButtonFormField2中移除默认填充并调整宽度。

答案2

得分: 0

将你的 DropdownButtonFormField 包装在一个 ButtonTheme 小部件中,并将 ButtonTheme 小部件的 alignedDropdown: true 属性设置为 true

英文:

Wrap your DropdownButtonFormField in a ButtonTheme widget, and set the alignedDropdown: true property of the ButtonTheme widget.

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  • 本文由 发表于 2023年6月6日 09:15:56
  • 转载请务必保留本文链接:https://go.coder-hub.com/76410863.html
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