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彈出對(duì)話框

Flyout Dialog提供了類似于彈出內(nèi)容容器的功能，允許您在應(yīng)用程序UI管理器組件的WindowsUI視圖中創(chuàng)建Windows 10風(fēng)格的彈出消息，但是Flyout Dialog允許在應(yīng)用程序中實(shí)現(xiàn)此功能，而無需使用任何其他組件。要顯示彈出式消息框或彈出窗口，只需在代碼中調(diào)用FlyoutDialog.Show方法。

C#：

DevExpress.XtraBars.Docking2010.Customization.FlyoutDialog.Show(. . .);

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VB.NET：

DevExpress.XtraBars.Docking2010.Customization.FlyoutDialog.Show(. . .)

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Show方法有多個(gè)重載。根據(jù)選擇的重載，必須將所有者、控件、彈出動(dòng)作、彈出屬性和謂詞作為參數(shù)傳遞。

Owner——將擁有顯示的彈出式消息框或彈出框的表，使用此關(guān)鍵字可將當(dāng)前表單設(shè)置為彈出框的父表單。
Control——在彈出框中顯示的控件或UserControl對(duì)象，下圖展示了一個(gè)空白的彈出式窗口，其中包含一個(gè)WindowsUIButtonPanel。

FlyoutAction ——一個(gè)FlyoutAction對(duì)象，它包含標(biāo)題、描述、圖像和一組在這個(gè)彈出框中顯示的按鈕。下圖展示了一個(gè)示例。

下面的代碼創(chuàng)建了一個(gè)帶有自定義標(biāo)題、描述和兩個(gè)Flyout命令(' Close '和' Cancel ')的Flyout Action，它們具有特定的 DialogResult 值。

C#：

DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutAction action = new DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutAction() { Caption = "Confirm", Description = "Close the application?" };
DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand command1 = new DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand() { Text = "Close", Result = System.Windows.Forms.DialogResult.Yes };
DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand command2 = new DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand() { Text = "Cancel", Result = System.Windows.Forms.DialogResult.No };
action.Commands.Add(command1);
action.Commands.Add(command2);

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VB.NET：

Dim command1 As New DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand() With { _
.Text = "Close", _
.Result = System.Windows.Forms.DialogResult.Yes _
}
Dim command2 As New DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand() With { _
.Text = "Cancel", _
.Result = System.Windows.Forms.DialogResult.No _
}
action.Commands.Add(command1)
action.Commands.Add(command2)

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提示：如果將Control 和FlyoutAction傳遞給FlyoutDialog.Show方法，F(xiàn)lyoutAction的標(biāo)題和按鈕將被顯示，而描述和圖像將被隱藏。

Flyout Properties——一個(gè) DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutProperties對(duì)象，用于存儲(chǔ)顯示的彈出框的高級(jí)屬性。例如，下面代碼中的Style屬性允許您選擇彈出樣式(在整個(gè)表單中顯示的消息框或彈出窗口)，ButtonSize屬性設(shè)置自定義動(dòng)作按鈕的大小。

C#：

FlyoutProperties properties = new FlyoutProperties();
properties.ButtonSize = new Size(100, 40);
properties.Style = FlyoutStyle.MessageBox;

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VB.NET：

Dim properties As New FlyoutProperties()
properties.ButtonSize = New Size(100, 40)
properties.Style = FlyoutStyle.MessageBox

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Predicate——引用一個(gè)布爾函數(shù)的謂詞，該函數(shù)接受一個(gè)DialogResult 值作為參數(shù)。該函數(shù)根據(jù)彈出框的輸出DialogResult 指定是否可以關(guān)閉彈出框，謂詞強(qiáng)制最終用戶單擊彈出按鈕，從而確保彈出不會(huì)通過任何其他方式關(guān)閉(例如，按“Esc”按鈕)。下面的代碼演示了一個(gè)示例。

C#：

Predicate<DialogResult> predicate = canCloseFunc;

private static bool canCloseFunc(DialogResult parameter) {
return parameter != DialogResult.Cancel;
}

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VB.NET：

Private predicate As Predicate(Of DialogResult) = AddressOf canCloseFunc

Private Shared Function canCloseFunc(ByVal parameter As DialogResult) As Boolean
Return parameter <> DialogResult.Cancel
End Function

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Show方法返回 DialogResult枚舉器值，該值允許檢查單擊了哪個(gè)FlyoutCommand。使用這個(gè)和上面的信息，您可以在父表單關(guān)閉時(shí)顯示一個(gè)彈出對(duì)話框，如下面的代碼所示。這段代碼顯示了一個(gè)帶有兩個(gè)按鈕的彈出消息框，使用的謂詞確保flyout只有在終端用戶在“Close”和“Cance”選項(xiàng)之間選擇后才會(huì)關(guān)閉。

C#：

private static bool canCloseFunc(DialogResult parameter) {
return parameter != DialogResult.Cancel;
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutAction action = new DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutAction() { Caption = "Confirm", Description = "Close the application?" };
Predicate<DialogResult> predicate = canCloseFunc;
DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand command1 = new DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand() { Text = "Close", Result = System.Windows.Forms.DialogResult.Yes };
DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand command2 = new DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand() { Text = "Cancel", Result = System.Windows.Forms.DialogResult.No };
action.Commands.Add(command1);
action.Commands.Add(command2);
FlyoutProperties properties = new FlyoutProperties();
properties.ButtonSize = new Size(100, 40);
properties.Style = FlyoutStyle.MessageBox;
if (FlyoutDialog.Show(this, action, properties, predicate) == System.Windows.Forms.DialogResult.Yes) e.Cancel = false;
else e.Cancel = true;
}

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VB.NET：

Private Shared Function canCloseFunc(ByVal parameter As DialogResult) As Boolean
Return parameter IsNot DialogResult.Cancel
End Function

Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs)
Dim action As New DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutAction() With {.Caption = "Confirm", .Description = "Close the application?"}
Dim predicate As Predicate(Of DialogResult) = AddressOf canCloseFunc
Dim command1 As New DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand() With {.Text = "Close", .Result = System.Windows.Forms.DialogResult.Yes}
Dim command2 As New DevExpress.XtraBars.Docking2010.Views.WindowsUI.FlyoutCommand() With {.Text = "Cancel", .Result = System.Windows.Forms.DialogResult.No}
action.Commands.Add(command1)
action.Commands.Add(command2)
Dim properties As New FlyoutProperties()
properties.ButtonSize = New Size(100, 40)
properties.Style = FlyoutStyle.MessageBox
If FlyoutDialog.Show(Me, action, properties, predicate) = System.Windows.Forms.DialogResult.Yes Then
e.Cancel = False
Else
e.Cancel = True
End If
End Sub

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