Figure D27 A DateTimePicker Control in Action in .NET

Generation QR Code ISO/IEC18004 in .NET Figure D27 A DateTimePicker Control in Action
Figure D27 A DateTimePicker Control in Action
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Figure D28 A DateTimePicker with ShowUpDown Enabled
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To retrieve the date or time from the control, you get the Value of the control: // Show the Date (or time) picked
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MessageBoxShow(dateTimePicker1ValueToShortDateString());
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HScrollBar
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The HScrollBar control, shown in Figure D29, is a horizontal scrollbar Although most controls that use a scrollbar do so automatically, you can use this control to specify a scrollbar for subtle uses such as specifying a range of large values You can specify the minimum and maximum range using the Minimum and Maximum properties: hScrollBar1Minimum = 0; hScrollBar1Maximum = 10;
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Figure D29 An HScrollBar Control in Action
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The ValueChanged event communicates when the value has changed, and the Value property exposes the current scroll value: void hScrollBar1_ValueChanged(object sender, EventArgs e) { MessageBoxShow("Current scroll value: " + hScrollBar1ValueToString()); }
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VScrollBar
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The VScrollBar control, shown in Figure D30, is a vertical scrollbar It is just like the HScrollBar but is drawn vertically instead of horizontally
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Figure D30 A VScrollBar Control in Action
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DomainUpDown
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The DomainUpDown control, shown in Figure D31, allows you to specify a list of items that the arrow buttons will switch between The functionality is much like that of the combo box, but this control does not support showing the entire list at once This control is ultimately a text box with the up/down control added so that the user can still type any desired text Retrieving data from the control is identical to retrieving data from a text box: MessageBoxShow(domainUpDown1Text);
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Figure D31 A DomainUpDown Control in Action
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NumericUpDown
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Functionally the NumericUpDown control is much like the DomainUpDown control, but the intention of this control is to allow the user to specify a numeric value The control, shown in Figure D32, supports minimum value, maximum value, and a step value to allow you to control which number can be selected You can select the numeric value of the control using the Value property: MessageBoxShow(numericUpDown1ValueToString());
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Figure D32 A NumericUpDown Control in Action
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TrackBar
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The track bar, shown in Figure D33, allows the user to specify a numeric value with a maximum and a minimum value The control captures the arrow, Page Up, and Page Down keys to control how the values are moved on the track bar You can specify the number of positions in the bar, the number of values between each visible tick, and the number of ticks to move on an arrow key move or on the Page Up and Page Down key moves You can catch the changed event of the track bar this way: void trackBar1_ValueChanged(object sender, SystemEventArgs e) { MessageBoxShow(trackBar1ValueToString()); }
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Figure D33 A TrackBar Control in Action
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ProgressBar
The progress bar, shown in Figure D34, is simply a user feedback control that displays a level of completion The control allows you to specify the minimum and maximum values, although the control continues to show the blocks shown here You call the increment method with a number for the amount to move the progress bar There is no decrement method, but incrementing with a negative value will cause the progress bar to back up: // Advance the Progress bar progressBar1Increment(1); // Decrement the Progress bar progressBar1Increment(-1);
Figure D34 A ProgressBar Control in Action
RichTextBox
The RichTextBox control, shown in Figure D35, is used for input and display of text formatted in the rich text format The control lets you set ranges of text with various fonts, colors, and sizes You can save the document in the rich text edit control using the SaveFile method: // Save the file richTextBox1SaveFile("myfilertf", RichTextBoxStreamTypeRichText);
Figure D35 A RichTextBox Control in Action
PrintPreviewControl
The PrintPreviewControl, shown in Figure D36, is used in creating a print preview window, as discussed in 7: Printing
Figure D36 A PrintPreviewControl Control in Action
Splitter
The Splitter control, shown in Figure D37, is used to allow dynamic resizing of a docked
control within a form Docking and splitting are discussed in detail in 2: Forms
Figure D37 A Splitter Control in Action
ToolBar
A ToolBar, shown in Figure D38, is similar to a main menu except that toolbars usually are used to specify buttons to press for quicker access to specific functionality The toolbar is made up of a collection of buttons exposed by the Buttons property The supported button styles are standard, toggle, separator, and drop-down The drop-down button allows you to specify a menu to show when the down button is pushed You can handle toolbar button clicks by handling the ButtonClick event on the toolbar itself and checking the sender to see which button was clicked: void toolBar1_ButtonClick( object sender, ToolBarButtonClickEventArgs e) { if( sender == toolBarButton1 ) { } else if( sender == toolBarButton2 ) { } }