c# - 样式RibbonComboBox内容

我正在学习WPF，RibbonComboBox控件使我头痛了好几个星期。

我终于似乎可以使用一些基本功能了。现在，我坚持应该是琐碎的事情，但与WPF的其余部分一样，不是。

这是我的XAML的一部分：

<RibbonGroup Header="Category">
    <RibbonComboBox Label="Category:" HorizontalContentAlignment="Left" SelectionBoxWidth="250">
        <RibbonGallery ColumnsStretchToFill="True" SelectedItem="{Binding SelectedCategory}">
            <RibbonGalleryCategory DisplayMemberPath="Text" MaxColumnCount="1" ItemsSource="{Binding Categories}">
            </RibbonGalleryCategory>
        </RibbonGallery>
    </RibbonComboBox>
    <RibbonComboBox Label="Subcategory:" HorizontalContentAlignment="Left" SelectionBoxWidth="250">
        <RibbonGallery MaxColumnCount="1" ColumnsStretchToFill="True" SelectedItem="{Binding SelectedSubcategory}">
            <RibbonGalleryCategory DisplayMemberPath="Text" ItemsSource="{Binding Subcategories}">
            </RibbonGalleryCategory>
        </RibbonGallery>
    </RibbonComboBox>
    <RibbonButton Label="Edit Categories" Command="local:EditCommands.Categories" SmallImageSource="Images\categories_sm.png" ToolTipTitle="Edit Categories" ToolTipDescription="Add, edit or delete categories and subcategories" ToolTipImageSource="Images\categories_sm.png"></RibbonButton>
</RibbonGroup>

我遇到的问题是组合框下拉菜单的选择部分仅与文本一样宽。 （我希望它与整个下拉菜单一样宽。）

如您所见，我添加了一些MaxColumnCount和ColumnStretchToFill属性。这些最初似乎有效，但是...


当代码刷新内容时，ColumnStretchToFill设置似乎被丢弃，选择栏再次仅与选择文本一样宽。
有RibbonComboBox，RibbonGallery和RibbonGalleryCategory的层次结构。我不知道为什么。这些元素中有多个具有MaxColumnCount和ColumnStretchToFill属性（以及其他注释属性）。我如何知道应为哪个元素设置这些属性？

最佳答案

为了实现您的目标，请执行以下操作：

<Ribbon>
    <RibbonGroup Header="Category" Height="100">
        <RibbonComboBox Label="Category:" >
            <RibbonGallery SelectedItem="{Binding SelectedCategory, Mode=TwoWay, IsAsync=True}" >
                <RibbonGalleryCategory  ItemsSource="{Binding Categories}" DisplayMemberPath="Name" ColumnsStretchToFill="True" MaxColumnCount="1" IsSharedColumnSizeScope="True" />
            </RibbonGallery>
        </RibbonComboBox>
        <RibbonComboBox Label="Subcategory:" >
            <RibbonGallery SelectedItem="{Binding SelectedSubCategory}" >
                <RibbonGalleryCategory  ItemsSource="{Binding SelectedCategory.SubCategories}" DisplayMemberPath="Name" ColumnsStretchToFill="True" MaxColumnCount="1" IsSharedColumnSizeScope="True"/>
            </RibbonGallery>
        </RibbonComboBox>
        <RibbonButton Label="Edit Categories"  ToolTipTitle="Edit Categories" ToolTipDescription="Add, edit or delete categories and subcategories" Command="{Binding AddCatCommand}"></RibbonButton>
    </RibbonGroup>
</Ribbon>

您必须设置IsSharedColumnSizeScope="True"才能使项目延伸到ComboBox。这样可以确保布局正确。

上面的示例显示了差异，因为我没有在第二个ComboBox上设置该属性。

希望这可以帮助。

编辑

这是一个简单的模型

public class Category {
        private ObservableCollection<Category> _subCats = new ObservableCollection<Category>();
        public string Name { get; set; }

        public ObservableCollection<Category> SubCategories => this._subCats;
    }

现在我在CodeBehind中放了一些ViewModel的东西

public partial class Window1 : INotifyPropertyChanged {

        private Category _selectedCategory;
        private ObservableCollection<Category> _categories = new ObservableCollection<Category>();
        private Category _selectedSubCategory;

        public Window1() {
            InitializeComponent();
            var cat = new Category() { Name = "Category 1" };
            cat.SubCategories.Add(new Category { Name = "Cat 1 - Subcat 1" });
            cat.SubCategories.Add(new Category { Name = "Cat 1 - Subcat 2" });
            cat.SubCategories.Add(new Category { Name = "Cat 1 - Subcat 3" });
            var cat2 = new Category() { Name = "Category 2" };
            cat2.SubCategories.Add(new Category { Name = "Cat 2 - Subcat 1" });
            cat2.SubCategories.Add(new Category { Name = "Cat 2 - Subcat 2" });
            var cat3 = new Category() { Name = "Category 3" };
            cat2.SubCategories.Add(new Category { Name = "Cat 3 - Subcat 2" });
            this.Categories.Add(cat);
            this.Categories.Add(cat2);
            this.Categories.Add(cat3);
            this.SelectedCategory = this.Categories.First();
            this.DataContext = this;
        }

        public ICommand AddCatCommand => new RelayCommand(x => {
            var newCat = new Category { Name = "Im New" };
            newCat.SubCategories.Add(new Category { Name = "I'm new too" });
            this.Categories.Add(newCat);
        });

        public Category SelectedCategory {
            get { return _selectedCategory; }
            set {
                if (Equals(value, _selectedCategory)) return;
                _selectedCategory = value;
                OnPropertyChanged();
            }
        }

        public Category SelectedSubCategory {
            get { return _selectedSubCategory; }
            set {
                if (Equals(value, _selectedSubCategory)) return;
                _selectedSubCategory = value;
                OnPropertyChanged();
            }
        }

        public ObservableCollection<Category> Categories => this._categories;

        public event PropertyChangedEventHandler PropertyChanged;

        [NotifyPropertyChangedInvocator]
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

清仓

您可能会注意到，所有使用过的集合都没有二传手，可以防止它们被覆盖。如果使用ItemsSource，则不应重置绑定的Collection，只需清除.Clear()，在上述示例中作为Button添加的新项目将向您显示

关于c# - 样式RibbonComboBox内容，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38755347/