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View

The view contains all the logic you need to render your graphical model to the screen. It handles the drawing and printing of the model, as well as the scrolling, sizing. The view's main function is to update sections of the screen when the model changes.

1 Grid

By default, each view is overlaid with a grid to which the components snap. You can show or hide the grid and turn on or turn off the snap feature. You can also change the color of the grid so that it is visible against the background color of the canvas.

By default, the grid rows and columns are 7 pixel. You can also change the distance. The grids in each view are independent of each other. Consequently, if you change the spacing or color of the grid in one view, the grids in other views will not be affected.

2 Selection Handle Size

Another visual detail that you should consider is how your components appear when they are selected. The selection handles are maintained by the form. You can designate set how large they are. You can also override the methods that draw the handles to change their appearance.

3 Component Tracking

Tracking the manipulation of components is another responsibility of the view. When an end-user moves, sizes or scales a component, tracking places an outline around the component. The purpose of this outline is to convey how the component would look if you dropped it in its current position.

4 Updating

The view observes a model. When an aspect of the model changes, it notifies all of its views. The view has an OnUpdate() method that receives these notifications. Then, it determines which sections of the view were effected by the change and redraws them.

5 Scrolling

Each view has scrollbars on right and bottom, the scrollbars will automatic show when the form size more large than the client.

6 Drag and Drop

XD++ allows you to use OLE drag-and-drop for moving components. You can only use this functionality if you initialized the OLE libraries in your application. To initialize the libraries, add a call to AfxOleInit() in the InitInstance() method of your application object.

Using OLE drag-and-drop enables the end-user to drag components from one window to another. It also supports the dragging copy operation. The dragging copy operation copies components the end-user is dragging to the new location instead of moving them. If you do not want to support this functionality or load the OLE DLLs, do not initialize OLE. When OLE is not initialized, the standard drag-and-drop capabilities included in the CFOBaseView object are available.

7. Separates a piece of user-interface functionality into a distinct component. Examples include MoveTool, LineTool, LinkTool, and ZoomTool. Tools can be added and removed from the controller and users can create and register their own custom user-interface tools.

8. Glue to the points of the shape, when you moving, sizing, creating shapes on the canvas, it will automatic glue to the points of the existing shapes on the canvas.

9.Zoom tool

The Zoom tool allows the user to zoom in and out using the mouse and the Magnification property in the view allows precise control over zooming.

10.Scrolling and Panning:

There are Scroll bars for scrolling the diagram and the Pan tool allows the user to scroll by clicking and dragging the mouse. The Origin property in the view provides precise control over scrolling.

11. Rulers:

The Rulers in XD++ are Zoom and scroll aware rulers and have support for english and metric units and include mouse position tracking.

12. Group and Ungroup:

The Group tool creates a new group and adds the currently selected nodes to it where as the Ungroup tool takes the currently selected group and breaks it apart.

13. Undo/Redo:

XD++ Undo/Redo is built on command architecture and the undo and redo stacks are maintained by the controller object.

14. Rotating Tool:

The Rotate toolbar contains tools for rotating objects in the symbol model. To rotate, move the mouse over the object you want to rotate and then hold down the left mouse button. Move the mouse to rotate the object and then release the left mouse button to complete the rotation.

15.Text Editing:

The Text tool is used to create and edit text nodes, whereas the Port tool is used to add connection ports to symbols.

For: Visual C++ 6.0, Visual C++ 7.0, Visual C++ 7.1, Visual C++ 8.0

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