Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
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Essential Silverlight 3- P4: Khái quát Silverlight 3 không chỉ là lấp đầy với các chi tiết kỹ thuật, ví dụ rõ ràng,
và thực hiện lời khuyên rằng sẽ làm cho bất kỳ ứng dụng Silverlight tốt hơn, nhưng
Ashraf cũng bao gồm những hiểu biết rằng chỉ có thể đến từ một trong những nhà phát triển dẫn
của thời gian chạy Silverlight. Từ đồ họa, văn bản, để phương tiện truyền thông cuốn sách này-
có tất cả các thông tin cần thiết về thời gian chạy lõi 3 Silverlight....
Nội dung trích xuất từ tài liệu:
Essential Silverlight 3- P4
118 Chapter 5: Input Events
Multiple Languages
Different operating system language settings can have different keyboard
mappings or language specific input methods for Far East languages. To
help you create applications that work on multiple languages, Silverlight
provides a TextBox element that provides text input for European and Far
East languages. In particular, you can use the Far East input method editors
or operating system mechanisms for inputting European accents with the
TextBox element.
For custom controls that require direct access to keyboard events,
Silverlight filters the basic key codes in the System.Windows.Input.Key
enumeration to only those available consistently in all supported
languages. In particular, keys such as the comma key are different in
different languages and do not appear in the Key enumeration. For
example, many European languages use a comma to indicate a decimal
separator in a number instead of a period. You can still access those
keys not in the Key enumeration by specifying their key code number;
however, you must test those events on all target languages.
Input Events
As discussed in Chapter 2, “Applications,” you can connect an event
handler to code by setting the event handler in XAML:
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Input Events 119
You can define this event handler in your C# code behind class:
namespace RectangleClick
{
public partial class Page : UserControl
{
private void MyRectangle_MouseLeftButtonDown(
object sender,
MouseButtonEventA rgs e
)
{
Rectangle myRectangle = (Rectangle)sender;
myRectangle.Fill = new SolidColorBrush(Colors.Blue);
}
}
}
Alternatively, you can connect an event handler programmatically in
your constructor:
namespace RectangleClick
{
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
// Hook up left mouse button down event
Rectangle myRectangle = (Rectangle)this.FindName(myRectangle);
myRectangle.MouseLeftButtonDown +=
new MouseButtonEventHandler(MyRectangle_MouseLeftButtonDown);
}
}
}
New in Silverlight 3
You can use mouse wheel events in Silverlight 3 by setting the MouseWheel
event handler.
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120 Chapter 5: Input Events
Mouse Input Events
Connecting mouse events to handlers is straightforward, as shown in the
previous examples. However, Silverlight must decide which element
should receive a particular event. This section discusses the three aspects
that determine which element gets the event: mouse capture, bubbling, and
hit-testing rules.
Mouse Capture
As previously shown, you can connect a MouseLeftButtonDown event handler
to an element to receive that event. Similarly, a MouseLeftButtonUp event is
available. In some cases, you may not receive a MouseLeftButtonUp event after
a MouseLeftButtonDown event. For example, if a user depresses the mouse but-
ton over an element, moves the mouse, and then releases the mouse button,
the mouse may no longer be over the target element and Silverlight does not
send the MouseLeftButtonUp event to your event handler.
If you want to guarantee a MouseLeftButtonUp event, you can take
mouse capture while the mouse button is down and release it when the
mouse button is up. For example, to have a simple rectangle change color
on mouse down and restore color on mouse up, you can connect your event
handlers in your page constructor and toggle properties to change the
rectangle color:
namespace RectangleClick
{
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
// Hook up event handlers for the rectangle
Rectangle myRectangle = (Rectangle)this.FindName(myRectangle);
myRectangle.MouseLeftButtonDown +=
new MouseButtonEventHandler(MyRectangle_MouseLeftButtonDown);
myRectangle.MouseLeftButtonUp +=
new MouseButtonEventHandler(MyRectangle_MouseLeftButtonUp);
}
private void MyRectangle_MouseLeftButtonDown(
object sender,
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Input Events 121
MouseButtonEventA rgs e
)
{
...
