申请的主要目的我在WPF工作是允许编辑并因此在其上打印带有吉他和弦的歌曲歌词。
即使你没有演奏任何乐器,你也可能已经看过和弦。为了给你一个想法,它看起来像这样:
E E6
I know I stand in line until you
E E6 F#m B F#m B
think you have the time to spend an evening with me
但是我不想使用这种丑陋的单行间距字体,而是希望Times New Roman
字体与歌词和和弦(粗体字和弦)进行字距调整。我希望用户能够编辑它。
这似乎不是RichTextBox
支持的方案。这些是我不知道如何解决的一些问题:
TextPointer
歌词行)。当用户编辑歌词时,我希望和弦保持在正确的角色上。例如:
E E6
I know !!!SOME TEXT REPLACED HERE!!! in line until you
E E6
think you have the time to spend an
F#m B F#m B
evening with me
F#m E6
...you have the ti me to spend...
Ta VA
和和弦A
。我希望歌词看起来像而不是。第二张图片未在V
和A
之间进行调整。橙色线条仅用于显示效果(但它们标记了将放置和弦的x偏移)。用于生成第一个样本的代码为<TextBlock FontFamily="Times New Roman" FontSize="60">Ta VA</TextBlock>
,第二个样本为<TextBlock FontFamily="Times New Roman" FontSize="60"><Span>Ta V<Floater />A</Span></TextBlock>
。有关如何让RichTextBox
执行此操作的任何想法?或者在WPF中有更好的方法吗?我会对Inline
或Run
进行细分吗?欢迎任何想法,黑客,TextPointer
魔术,代码或相关主题的链接。
我正在探索解决这个问题的两个主要方向,但两者都会导致另一个问题,所以我问了一个新问题:
RichTextBox
转换为和弦编辑器 - 请查看How can I create subclass of class Inline?。根据H.B. answer中的建议,从Panel
s TextBox
es等单独的组件构建新的编辑器。这需要大量编码,并导致以下(未解决)问题:
Markus Hütter's high quality answer告诉我,使用RichTextBox
可以做更多事情,然后当我尝试根据自己的需要进行调整时,我预计会这样做。我现在有时间详细探讨答案。马库斯可能是RichTextBox
魔术师我需要帮助我,但他的解决方案也有一些未解决的问题:
LineHeight
设置为25
或整个文档的其他固定值时,它将导致没有和弦的行有&#34;空行&#34;在他们上面。当只有和弦而没有文字时,就没有空间。还有其他一些小问题,但我想我可以解决它们,或者我认为它们并不重要。无论如何,我认为马库斯的回答非常有价值 - 不仅是为了向我展示可行的方式,而且也是为了展示使用RichTextBox
与装饰师的一般模式。
答案 0 :(得分:16)
我不能给你任何具体的帮助,但就建筑而言,你需要从这个
改变你的布局
到此
其他一切都是黑客攻击。你的单位/字形必须成为单词和弦对。
编辑:我一直在使用模板化的ItemsControl,它甚至可以在某种程度上发挥作用,所以它可能会引起人们的兴趣。
<ItemsControl Grid.IsSharedSizeScope="True" ItemsSource="{Binding SheetData}"
Name="_chordEditor">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition SharedSizeGroup="A" Height="Auto"/>
<RowDefinition SharedSizeGroup="B" Height="Auto"/>
</Grid.RowDefinitions>
<Grid.Children>
<TextBox Name="chordTB" Grid.Row="0" Text="{Binding Chord}"/>
<TextBox Name="wordTB" Grid.Row="1" Text="{Binding Word}"
PreviewKeyDown="Glyph_Word_KeyDown" TextChanged="Glyph_Word_TextChanged"/>
</Grid.Children>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
private readonly ObservableCollection<ChordWordPair> _sheetData = new ObservableCollection<ChordWordPair>();
public ObservableCollection<ChordWordPair> SheetData
{
get { return _sheetData; }
}
public class ChordWordPair: INotifyPropertyChanged
{
private string _chord = String.Empty;
public string Chord
{
get { return _chord; }
set
{
if (_chord != value)
{
_chord = value;
// This uses some reflection extension method,
// a normal event raising method would do just fine.
PropertyChanged.Notify(() => this.Chord);
}
}
}
private string _word = String.Empty;
public string Word
{
get { return _word; }
set
{
if (_word != value)
{
_word = value;
PropertyChanged.Notify(() => this.Word);
}
}
}
public ChordWordPair() { }
public ChordWordPair(string word, string chord)
{
Word = word;
Chord = chord;
}
public event PropertyChangedEventHandler PropertyChanged;
}
private void AddNewGlyph(string text, int index)
{
var glyph = new ChordWordPair(text, String.Empty);
SheetData.Insert(index, glyph);
FocusGlyphTextBox(glyph, false);
}
private void FocusGlyphTextBox(ChordWordPair glyph, bool moveCaretToEnd)
{
var cp = _chordEditor.ItemContainerGenerator.ContainerFromItem(glyph) as ContentPresenter;
Action focusAction = () =>
{
var grid = VisualTreeHelper.GetChild(cp, 0) as Grid;
var wordTB = grid.Children[1] as TextBox;
Keyboard.Focus(wordTB);
if (moveCaretToEnd)
{
wordTB.CaretIndex = int.MaxValue;
}
};
if (!cp.IsLoaded)
{
cp.Loaded += (s, e) => focusAction.Invoke();
}
else
{
focusAction.Invoke();
}
}
private void Glyph_Word_TextChanged(object sender, TextChangedEventArgs e)
{
var glyph = (sender as FrameworkElement).DataContext as ChordWordPair;
var tb = sender as TextBox;
string[] glyphs = tb.Text.Split(' ');
if (glyphs.Length > 1)
{
glyph.Word = glyphs[0];
for (int i = 1; i < glyphs.Length; i++)
{
AddNewGlyph(glyphs[i], SheetData.IndexOf(glyph) + i);
}
}
}
private void Glyph_Word_KeyDown(object sender, KeyEventArgs e)
{
var tb = sender as TextBox;
var glyph = (sender as FrameworkElement).DataContext as ChordWordPair;
if (e.Key == Key.Left && tb.CaretIndex == 0 || e.Key == Key.Back && tb.Text == String.Empty)
{
int i = SheetData.IndexOf(glyph);
if (i > 0)
{
var leftGlyph = SheetData[i - 1];
FocusGlyphTextBox(leftGlyph, true);
e.Handled = true;
if (e.Key == Key.Back) SheetData.Remove(glyph);
}
}
if (e.Key == Key.Right && tb.CaretIndex == tb.Text.Length)
{
int i = SheetData.IndexOf(glyph);
if (i < SheetData.Count - 1)
{
var rightGlyph = SheetData[i + 1];
FocusGlyphTextBox(rightGlyph, false);
e.Handled = true;
}
}
}
最初应该将一些字形添加到集合中,否则将没有输入字段(可以通过进一步模板化来避免这种情况,例如,如果集合为空,则使用显示字段的数据触发器。)
完善这一点需要进行大量额外的工作,例如设置TextBoxes样式,添加书写换行符(现在它只在换行组件制作时断开),支持多个文本框中的选择等。
答案 1 :(得分:12)
Soooo,我在这里玩得很开心。这就是它的样子:
歌词是完全可编辑的,和弦目前不是(但这将是一个简单的扩展)。
这是xaml:
<Window ...>
<AdornerDecorator>
<!-- setting the LineHeight enables us to position the Adorner on top of the text -->
<RichTextBox TextBlock.LineHeight="25" Padding="0,25,0,0" Name="RTB"/>
</AdornerDecorator>
</Window>
这是代码:
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
const string input = "E E6\nI know I stand in line until you\nE E6 F#m B F#m B\nthink you have the time to spend an evening with me ";
var lines = input.Split('\n');
var paragraph = new Paragraph{Margin = new Thickness(0),Padding = new Thickness(0)}; // Paragraph sets default margins, don't want those
RTB.Document = new FlowDocument(paragraph);
// this is getting the AdornerLayer, we explicitly included in the xaml.
// in it's visual tree the RTB actually has an AdornerLayer, that would rather
// be the AdornerLayer we want to get
// for that you will either want to subclass RichTextBox to expose the Child of
// GetTemplateChild("ContentElement") (which supposedly is the ScrollViewer
// that hosts the FlowDocument as of http://msdn.microsoft.com/en-us/library/ff457769(v=vs.95).aspx
// , I hope this holds true for WPF as well, I rather remember this being something
// called "PART_ScrollSomething", but I'm sure you will find that out)
//
// another option would be to not subclass from RTB and just traverse the VisualTree
// with the VisualTreeHelper to find the UIElement that you can use for GetAdornerLayer
var adornerLayer = AdornerLayer.GetAdornerLayer(RTB);
for (var i = 1; i < lines.Length; i += 2)
{
var run = new Run(lines[i]);
paragraph.Inlines.Add(run);
paragraph.Inlines.Add(new LineBreak());
var chordpos = lines[i - 1].Split(' ');
var pos = 0;
foreach (string t in chordpos)
{
if (!string.IsNullOrEmpty(t))
{
var position = run.ContentStart.GetPositionAtOffset(pos);
adornerLayer.Add(new ChordAdorner(RTB,t,position));
}
pos += t.Length + 1;
}
}
}
}
使用此Adorner:
public class ChordAdorner : Adorner
{
private readonly TextPointer _position;
private static readonly PropertyInfo TextViewProperty = typeof(TextSelection).GetProperty("TextView", BindingFlags.Instance | BindingFlags.NonPublic);
private static readonly EventInfo TextViewUpdateEvent = TextViewProperty.PropertyType.GetEvent("Updated");
private readonly FormattedText _formattedText;
public ChordAdorner(RichTextBox adornedElement, string chord, TextPointer position) : base(adornedElement)
{
_position = position;
// I'm in no way associated with the font used, nor recommend it, it's just the first example I found of FormattedText
_formattedText = new FormattedText(chord, CultureInfo.GetCultureInfo("en-us"),FlowDirection.LeftToRight,new Typeface(new FontFamily("Arial").ToString()),12,Brushes.Black);
// this is where the magic starts
// you would otherwise not know when to actually reposition the drawn Chords
// you could otherwise only subscribe to TextChanged and schedule a Dispatcher
// call to update this Adorner, which either fires too often or not often enough
// that's why you're using the RichTextBox.Selection.TextView.Updated event
// (you're then basically updating the same time that the Caret-Adorner
// updates it's position)
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(() =>
{
object textView = TextViewProperty.GetValue(adornedElement.Selection, null);
TextViewUpdateEvent.AddEventHandler(textView, Delegate.CreateDelegate(TextViewUpdateEvent.EventHandlerType, ((Action<object, EventArgs>)TextViewUpdated).Target, ((Action<object, EventArgs>)TextViewUpdated).Method));
InvalidateVisual(); //call here an event that triggers the update, if
//you later decide you want to include a whole VisualTree
//you will have to change this as well as this ----------.
})); // |
} // |
// |
public void TextViewUpdated(object sender, EventArgs e) // |
{ // V
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(InvalidateVisual));
}
protected override void OnRender(DrawingContext drawingContext)
{
if(!_position.HasValidLayout) return; // with the current setup this *should* always be true. check anyway
var pos = _position.GetCharacterRect(LogicalDirection.Forward).TopLeft;
pos += new Vector(0, -10); //reposition so it's on top of the line
drawingContext.DrawText(_formattedText,pos);
}
}
这是使用像大卫建议的装饰,但我知道很难找到如何在那里。那可能是因为没有。我花了几个小时才在反射器中试图找到确切的事件,表明流文档的布局已经找到了。
我不确定实际上是否需要在构造函数中调度调度程序,但是我将其保留为防弹。 (我需要这个,因为在我的设置中还没有显示RichTextBox)。
显然这需要更多编码,但这会给你一个开始。你会想要玩定位等等。
如果两个装饰品太靠近并且重叠,为了获得正确的定位,我建议您以某种方式跟踪之前的装饰,并查看当前装饰是否会重叠。然后你可以在_position
- TextPointer。
如果您以后决定,您也希望和弦可以编辑,那么您可以在OnRender中绘制文本,而不是只在装饰器下面创建一个完整的VisualTree。 (here是下面有ContentControl的装饰器的示例)。请注意,您必须处理ArrangeOveride,然后通过_position
CharacterRect正确定位Adorner。