Articles on C++ programming language.
This Example, If your Windows theme is default, the Start Progress button will start progress with a grey background and blue bar. We imitate the bar motion by adding a small delay as it progresses. The Reset Progress button will return the progress to the beginning. The sample’s Set Red button changes the foreground colour to Red and the background colour to white.
The picture shows the screenshot of example.
When the user clicks the browse button, the example displays file selection dialog. From this dialog, user picks a file name. The example shows the file properties in the relevant user interface items as in the above screen.
The SDI sample, under the file menu, has two menu items called Hook CAPS Lock, Unhook CAPS Lock. When the user clicks the Hook Caps Lock menu item, the Keyboard hook is attached to the application and hooks the keyboard event. The UnHook CAPS Lock event removes installed hook from the application.
Our example SDI contains two menu items called First Dialog and Second Dialog under view menu. These menu items will bring up two dialogs with text boxes in it. When a hook is installed, you can type only the capital letters in the dialogs. After opting for the Un-Hook action, you will not have upper case constraint on the dialogs. Let us jump into the explanation-based walk-through.
In the previous MFC Article, we examined how the Mapping Modes works while performing the drawing operation. In this example, we will see how we set the custom mapping modes. Our goal is below:
1) Set mapping mode so that the horizontal logical unit is 1 Centimeter (cm). Simply, 1 Unit = 1 cm in X axis.
2) Also, 1 Unit = 1 cm in Y Axis.
3) Positive X is towards left.
4) Positive Y is going Upwards.
5) The Drawing origin should be in screen center.
We can achieve the above goal by using the Custom Mapping mode MM_ISOTROPIC.
MFC supports two kinds of coordinate systems. One is Device Coordinate and the other one is Logical Coordinate. In device coordinate, we point out all in terms of pixels. In logical coordinate, we measure each unit in terms of Metric Standard or British Standard. How each unit maps to the logical measure is called the mapping. We can mention the mapping using the Mapping Modes. In MFC, having the knowledge of Drawing Origin is the key to draw in the Client Area the way you want.
In this Example, we will walk through the examples and demo videos, which will help us in learning the Mapping Modes and doing the MFC drawing using the device contexts. We will also try the ViewPort Origin and Window Origin and how to use them while drawing using MFC GDI APIs.