我的目標是創建一個Canvas,您可以通過在整個畫布中移動來將子元素翻譯到您想要的位置(例如,在犀牛的蚱蜢插件中)。我嘗試過使用「translateTransform」,但後來出現的問題是,畫布的高度或寬度不夠大,無法再包括整個窗口。我試圖解決這個問題,只要Canvas被拖動,就將寬度和高度添加到Canvas中,但Canvas的大小似乎沒有改變。如何在WPF中實現「無限大小」的畫布效果?
這裏是我的window.xaml:
<Window x:Name="Window" x:Class="Oolong.Windows.Project.ProjectPlan"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Oolong.Windows.Project"
mc:Ignorable="d"
Title="Projektplan" Height="{DynamicResource {x:Static SystemParameters.PrimaryScreenHeightKey}}" Width="{DynamicResource {x:Static SystemParameters.PrimaryScreenWidthKey}}" WindowStartupLocation="CenterOwner" ShowInTaskbar="False" Icon="/Oolong;component/Resources/Images/icon2.png">
<Window.Background>
<ImageBrush ImageSource="/Oolong;component/Resources/Images/ui/canvas_bg.png" TileMode="FlipY" Stretch="Uniform" AlignmentY="Top" Viewport="0,0,150,50" ViewportUnits="Absolute" />
</Window.Background>
<Canvas x:Name="Grid" ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Auto" MouseLeftButtonDown="Grid_OnMouseLeftButtonDown" MouseDown="Grid_MouseDown" MouseMove="Grid_MouseMove" MouseUp="Grid_MouseUp" MouseWheel="Grid_OnMouseWheel" Width="{DynamicResource {x:Static SystemParameters.MaximizedPrimaryScreenWidthKey}}" Height="{DynamicResource {x:Static SystemParameters.MaximizedPrimaryScreenHeightKey}}">
<Rectangle x:Name="NewTaskRectangle" Fill="#FFF4F4F5" HorizontalAlignment="Left" Height="87" Margin="0,0,0,0" Stroke="Black" VerticalAlignment="Top" Width="208" Visibility="Hidden"/>
<Label x:Name="NewTaskLabel" Content="Gib den Namen der Aufgabe ein..." HorizontalAlignment="Left" Margin="10,17,0,0" VerticalAlignment="Top" Visibility="Hidden"/>
<TextBox x:Name="NewTaskTextBox" HorizontalAlignment="Left" Height="23" Margin="10,48,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="189" Visibility="Hidden" KeyUp="NewTaskTextBox_OnKeyUp"/>
<Border x:Name="NewTaskTemplate" BorderBrush="Black" BorderThickness="2.5" HorizontalAlignment="Left" Height="30" Margin="0" VerticalAlignment="Top" Background="#FFE2C027" Padding="5" Focusable="True" CornerRadius="6" Width="15" Visibility="Hidden" MinWidth="150" MinHeight="30" MouseRightButtonUp="NewTaskTemplate_OnMouseRightButtonUp">
<Border.ContextMenu>
<ContextMenu x:Name="NewTaskContextMenu">
<MenuItem x:Name="AddIssueMenuItem" Header="Arbeitsschritt hinzufügen" Click="AddIssueMenuItem_OnClick"/>
<MenuItem x:Name="DeleteMenuItem" Header="Löschen" Click="DeleteMenuItem_OnClick"/>
</ContextMenu>
</Border.ContextMenu>
</Border>
<Canvas.RenderTransform>
<TransformGroup>
<ScaleTransform x:Name="ScaleTransform"/>
<TranslateTransform x:Name="Tt" />
</TransformGroup>
</Canvas.RenderTransform>
</Canvas>
</Window>
這裏的有關C#代碼:
private void NewTaskTemplate_OnMouseRightButtonUp(object sender, MouseButtonEventArgs e)
{
Point position = e.GetPosition(Grid);
bool hasClickedOnTask = false;
if (App.ProjectPlan.Tasks != null)
{
var tasks = App.ProjectPlan.Tasks.DistinctBy(task => task.Position);
var selectedTasks =
tasks.Where(
(task =>
Math.Abs(task.Position.X - position.X + 10) < task.Title.Length*13 &&
Math.Abs(task.Position.Y - position.Y) < 20));
IEnumerable<Task> enumerable = selectedTasks as Task[] ?? selectedTasks.ToArray();
if (enumerable.Any())
{
_selectedTask = enumerable.Last();
hasClickedOnTask = true;
}
}
if (!hasClickedOnTask) return;
NewTaskContextMenu.IsOpen = true;
e.Handled = true;
SetGridSize();
}
Point _mStart;
Vector _mStartOffset;
private void SetGridSize()
{
Grid.Width += 250;
Grid.Height += 250;
Grid.UpdateLayout();
}
private void Grid_MouseDown(object sender, MouseButtonEventArgs e)
{
Grid.Cursor = Cursors.ScrollAll;
_mStart = e.GetPosition(Window);
_mStartOffset = new Vector(Tt.X, Tt.Y);
Grid.CaptureMouse();
}
private void Grid_MouseMove(object sender, MouseEventArgs e)
{
if (Grid.IsMouseCaptured)
{
Vector offset = Point.Subtract(e.GetPosition(Window), _mStart);
Tt.X = _mStartOffset.X + offset.X;
Tt.Y = _mStartOffset.Y + offset.Y;
SetGridSize();
}
}
private void Grid_MouseUp(object sender, MouseButtonEventArgs e)
{
Grid.ReleaseMouseCapture();
Grid.Cursor = Cursors.Arrow;
}
private void Grid_OnMouseWheel(object sender, MouseWheelEventArgs e)
{
Point position = e.GetPosition(Window);
ScaleTransform.CenterX = position.X;
ScaleTransform.CenterY = position.Y;
_gridZoom = _gridZoom + e.Delta/2400.00;
ScaleTransform.ScaleX = _gridZoom;
ScaleTransform.ScaleY = _gridZoom;
if (e.Delta > 0)
{
SetGridSize();
}
e.Handled = true;
}
畫布是在開始的網格,但沒有任何工作。它的工作原理是圍繞畫布移動,當然包括所有元素,但如果將它放在窗外,則不能再移動任何東西,因爲畫布不再存在。我如何解決這個問題,讓用戶覺得畫布是無限的?
我嘗試添加一個網格容器周圍原有電網和火在容器上的事件,但僅改造內部網,但不幸的是,這並不解決問題,我不知道爲什麼。 .. – hardking
因此,您有一個視覺區域,它是潛在的無限邏輯區域的一部分,您希望將元素放置在邏輯區域上,並且想要以某種方式拖動它,以避免將邏輯區域的邊緣拖入視覺區域? – grek40
我不確定我是否正確理解了你,但是如果我的答案是肯定的......網格應該可以無限拖曳到右側或左側,但是當拖到窗口的邊界時,然後執行在中間右鍵單擊顯示網格剛剛完全移動到左側或右側,無法在此鼠標位置翻譯 – hardking