Figure 828 Dragging without Ctrl, Causing a Move in .NET

Making QR Code in .NET Figure 828 Dragging without Ctrl, Causing a Move
Figure 828 Dragging without Ctrl, Causing a Move
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Figure 829 shows the same operation with the Ctrl key pressed, indicating a copy effect
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Figure 829 Dragging with Ctrl, Causing a Copy
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In our sample, when the user drops the data with no modifiers, indicating a move, the text is removed from the button when it drops the text to the text box, as shown in Figure 830
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Figure 830 After a Drag-and-Drop Move Operation
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To handle multiple effects in the drop source, you must specify which effects are allowed and check the resulting effect after the DoDragDrop method returns: void button3_MouseDown(object sender, MouseEventArgs e) { DragDropEffects effect = DoDragDrop( button3Text, DragDropEffectsCopy | DragDropEffectsMove); // If the effect was move, remove the text of the button // If the effect was a copy, we don't have anything to do if( effect == DragDropEffectsMove ) { button3Text = ""; } } Drag and drop is a great way to allow your mouse-oriented users to directly manipulate the data that your application presents without an undue development burden on you [ Team LiB ]
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Where Are We
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Controls are a way to repackage hunks of user interaction and behavior for the user Controls can also provide a great many niceties to make them more approachable for the developer That's what 9 is all about, for non-GUI components as well as GUI controls [ Team LiB ]
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9 Design-Time Integration
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A component is a nonvisual class designed specifically to integrate with a design-time environment such as Visual Studio NET WinForms provides several standard components, and NET lets you build your own, gaining a great deal of design-time integration with very little work On the other hand, with a bit more effort, you can integrate nonvisual components and controls very tightly into the design-time environment, providing a rich development experience for the programmer using your custom components and controls [ Team LiB ]
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Components
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Recall from 8: Controls that controls gain integration into VSNET merely by deriving from the Control base class in the SystemWindowsForms namespace That's not the whole story What makes a control special is that it's one kind of component : a NET class that integrates with a design-time environment such as VSNET A component can show up on the Toolbox along with controls and can be dropped onto any design surface Dropping a component onto a design surface makes it available to set the property or handle the events in the Designer, just as a control is Figure 91 shows the difference between a hosted control and a hosted component
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Figure 91 Locations of Components and Controls Hosted on a Form
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Standard Components
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It's so useful to be able to create instances of nonvisual components and use the Designer to code against them that WinForms comes with several components out of the box: Standard dialogs The ColorDialog, FolderBrowserDialog, FontDialog, OpenFileDialog, PageSetupDialog, PrintDialog, PrintPreviewDialog, and SaveFileDialog classes make up the bulk of the standard components that WinForms provides The printing-related components are covered in detail in 7: Printing Menus The MainMenu and ContextMenu components provide a form's menu bar and a control's context menu They're both covered in detail in 2: Forms User information The ErrorProvider, HelpProvider, and ToolTip components provide the user with varying degrees of help in using a form and are covered in 2: Forms Notify icon The NotifyIcon component puts an icon on the shell's TaskBar, giving the user a way to interact with an application without the screen real estate requirements of a window For an example, see Appendix D: Standard WinForms Components and Controls Image List The ImageList component keeps track of a developer-provided list of images for use with controls that need images when drawing 8: Controls shows how to use them
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Timer The Timer component fires an event at a set interval measured in milliseconds
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Using Standard Components
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What makes components useful is that they can be manipulated in the design-time environment For example, imagine that you'd like a user to be able to set an alarm in an application and to notify the user when the alarm goes off You can implement that using a Timer component Dropping a Timer component onto a Form allows you to set the Enabled and Interval properties as well as handle the Tick event in the Designer, which generates code such as the following into InitializeComponent: void InitializeComponent() { thiscomponents = new Container(); thistimer1 = new Timer(thiscomponents); // timer1 thistimer1Enabled = true; thistimer1Tick += new EventHandler(thistimer1_Tick); } As you have probably come to expect by now, the Designer-generated code looks very much like what you'd write yourself What's interesting about this sample InitializeComponent implementation is that when a new component is created, it's put on a list with the other components on the form This is similar to the Controls collection that is used by a form to keep track of the controls on the form After the Designer has generated most of the Timer-related code for us, we can implement the rest of the alarm functionality for our form: DateTime alarm = DateTimeMaxValue; // No alarm void setAlarmButton_Click(object sender, EventArgs e) { alarm = dateTimePicker1Value; } // Handle the Timer's Tick event void timer1_Tick(object sender, SystemEventArgs e) { statusBar1Text = DateTimeNowTimeOfDayToString(); // Check to see whether we're within 1 second of the alarm double seconds = (DateTimeNow - alarm)TotalSeconds; if( (seconds >= 0) && (seconds <= 1) ) { alarm = DateTimeMaxValue; // Show alarm only once MessageBoxShow("Wake Up!"); } } In this sample, when the timer goes off every 100 milliseconds (the default value), we check to see whether we're within 1 second of the alarm If we are, we shut off the alarm and notify the user, as shown in Figure 92