create 2d barcode vb.net menuImage_ChildClick in C#

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public MainForm() { . . .
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menuImage_ChildClick(menuScale, EventArgs.Empty); }
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in this constructor.
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a. Use the menuScale menu as the sender parameter. b. Use EventArgs.Empty for the event parameter.
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Note: This call must occur after the InitializeComponent method has been called to ensure that the menu objects have been initialized.
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Now you can compile and run the application to see the amazing ResizeRedraw style in action. This code uses the static EventArgs.Empty property we saw in chapter 6 to provide a valid, albeit empty, event argument to the handler.
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If you are tired of reading, modify your code to use the Resize event instead of the ResizeRedraw control style. This change reduces the processing required when an Image submenu item is selected, at the expense of additional processing whenever the window is resized. Do this by overriding the OnResize method for the form, and use the _selectedMode field to invalidate the window as required. Another change you can make is to modify the form to do double buffering. This removes the flicker that currently occurs when resizing the image. To do this, use the following code in the menuImage_ChildClick method:
SetStyle(ControlStyles.UserPaint, true); SetStyle(ControlStyles.DoubleBuffer, true); SetStyle(ControlStyles.AllPaintingInWmPaint, true);
This completes the drawing of an image within the window. While we have lost our border, we are now able to draw the image in our window using either the Stretch to Fit or Scale to Fit display options. Our next task is to handle the Actual Size menu to draw the full-sized image in the window. This requires the use of scroll bars and will lead us into a discussion of the Panel class.
AUTOMATED SCROLLING
The implementation of the Actual Size menu option allows us to look at the ScrollableControl class in more detail. As we have seen, the actual image is often larger than the form s client area. In chapter 3, the PictureBox control did not support
DRAWING AND SCROLLING
scrolling and we could only view the rest of the image by resizing the form. Here, we will use scroll bars via the ScrollableContainer class members to provide a more appropriate solution. The result of our labors is shown in figure 7.4. As you can see, part of the image is shown, and scroll bars at the right and bottom of the image can be used to scroll to the remainder of the image. These scroll bars will appear and disappear automatically as needed. You may wonder where our status bar has gone. This is an unfortunate side effect drawing directly on our form, and is the reason a section 7.4 exists in this chapter. More on this later.
Figure 7.4 The scroll bars for the form appear automatically when the display area is larger than the client area.
PROPERTIES FOR SCROLLING We already have the Actual Size menu available, but we need to add the appropriate processing when this menu is clicked and in the OnPaint method. Before we write any code, let s consider which properties we need from the ScrollableControl class.
ScrollableControl properties for scrolling our image Property AutoScroll AutoScrollMinSize Purpose Whether scrolling is enabled. We will set this to true for the Actual Size mode, and false for other display modes. The minimum size for the scrollable window. This is the display size, and not the actual client size seen by the user. We will set this to the size of the current image to ensure that the scroll bars are sized appropriately for this image. The window position, in pixels, at the upper left corner of the window. This property is adjusted automatically as the window scrolls.
AutoScrollPosition
IMPLEMENTING AUTOMATED SCROLLING Now that we have reviewed some of the properties used for automated scrolling, we can tackle the code required for the ActualSize display mode. We will start with the menu click, and handle the painting of the image in a moment. 213
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