[Continue MFC] common MFC classes-cbitmap, cbrush, and cbutton

Cbitmap

Cobject

└ Cgdiobject

└ Cbitmap

Cbitmap class encapsulates bitmaps in the Windows Graphics Device Interface (GDI) and provides member functions to manipulate bitmaps. Before using the cbitmap object, you must first construct the cbitmap object and call one of the initialization member functions to set the handle of the bitmap object. Then you can call other member functions. For more information about how to use graphical objects such as cbitmap, see "graphic objects" in the "visual c ++ programmer's Guide ".
# Include <afxwin. h>

Members of the cbitmap class

Constructor

Cbitmap

Construct a cbitmap object

Initialization Function

Loadbitmap	Loads a named bitmap resource from the executable file of the application to initialize the bitmap object.
Loadoembitmap	Load a predefined Windows bitmap to initialize the bitmap object.
Loadmappedbitmap	Load a bitmap and map its color to the system color.
Createbitmap	Initializes a bitmap object with a memory bitmap that depends on the device in the specified width, height, and bitmap mode.
Createbitmapindirect	Initialize a bitmap object using a bitmap with the given width, height, and mode (which can be left unspecified ).
Createcompatiblebitmap	Initializes an object with a bitmap to make it compatible with the specified device.
Creatediscardablebitmap	Initializes an object with a discarded bitmap compatible with the specified device

Attribute

Getbitmap	Fill bitmap structure with bitmap Information
Operator hbitmap	Returns the Windows handle on the cbitmap object.

Operation

Fromhandle	Returns the pointer to the cbitmap object when giving a pointer to the Windows hbitmap structure.
Setbitmapbits	Set the bitmap bit to the specified value.
Getbitmapbits	Copy the bitmap value to the specified buffer.
Setbitmapdimension	Set the bitmap width and height (in 0.1mm)
Getbitmapdimension	Returns the width and height of the bitmap. You must have called setbitmapdimension to set the width and height of the bitmap.

 

Cbrush

Cobject

└ Cgdiobject

└ Cbrush

Cbrush class encapsulates the image brush in the Windows Graphical device interface (GDI. Construct a cbrush object before passing it to the CDC member function that needs to be painted. The paint brush can be solid, shadow, or pattern. For more information about image painter, see the graphic object section in the "Visual C ++ programmer Guide.
# Include <afxwin. h>

Cbrush class member

Constructor

Cbrush

Construct a cbrush object

Initialization Function

Createsolidbrush	Initialize the image brush with the specified solid line
Createhatchbrush	Initialize the paint brush with the specified Shadow Line
Createbrushindirect	Initialize the paint brush with the style, color, and mode specified in the structure logbrush
Createpatternbrush	Initialize the image brush in the pattern specified by the bitmap
Createdibpatternbrush	Initialize the image brush with a device-independent Bitmap (DIB)
Createsyscolorbrush	Create a paint brush that uses the default color of the system

Operation

Fromhandle

Returns a pointer to the cbrush object when a Windows hbrush object handle is given.

Attribute

Getlogbrush	Obtain a logbrush Structure
Operator hbrush	Returns the Windows handle on the cbrush object.

 

Cbutton

Cobject

└ C0000target

└ Cwnd

└ Cbutton

Class cbutton provides operations on Windows button controls. The button control is a small rectangle subwindow, which can be selected by clicking (Press) or not selected. Buttons can be used independently or in groups. They can also have text headers. When you click it, the button usually needs to change the display appearance.
Typical button controls include check boxes, single-choice buttons, and push buttons ). A cbutton object can be one of them, which is determined by its button style and the initialization of the member function create.
In addition, the class cbuttonbitmap is inherited from the class cbutton, But it supports button image labels. A cbuttonbitmap object can set different bitmaps for its four States (not pressed, pressed, focused, and inaccessible.
You can create a button control in the dialog box template or directly in the code.
In either case, you must first call the constructor cbutton to construct a cbutton object, then call the member function create to create a Windows button control and apply it to the cbutton object.
In a class derived from cbutton, the construction can be completed in one step. A programmer can compile a constructor for this derived class and call the create function.
If you want to process windows notification messages, such as the messages sent by the bitmap button control to its parent object (typically inherited from cdialog, add the message ing entry to the parent object and the member functions that process each message.
The format of each message ing entry is as follows:
On_notification (ID, memberfxn)
The ID specifies the ID of the subwindow of the control that sends the notification, while the memberfxn specifies the member function name in the parent object that processes the notification.
The function prototype of the parent object is as follows:
Afx_msg void memberfxn ();
Possible message ing entries are as follows:

Ing entry	When to send messages to the parent object
On_bn_clicked	When you click a button
On_bn_doubleclicked	When you double-click a button

If a cbutton object is created in the dialog box resource, the cbutton object is automatically revoked when the user closes the dialog box. If a cbutton object is created in the window, you may need to undo it yourself. If the new function is used to create the object in the heap of the memory, you must use the delete function to cancel the window button control when closing the window. If this object is created in the stack or embedded in the parent dialog box, the system automatically revokes it.
# Include <afxwin. h>

Cbutton class member

Constructor

Cbutton

Construct a cbutton object

Initialization Function

Create

Create a Windows button control and apply it to the cbutton object

Operation

Getstate	Retrieves the selected, highlighted, and focused status of the button control.
Setstate	Set the highlighted status of the button control
Getcheck	Retrieves the selected status of the button control.
Setcheck	Set the selected status of the button control
Getbuttonstyle	Retrieving the style of a button control
Setbuttonstyle	Set the style of the button control
GetIcon	Retrieve the icon handle set by calling seticon
Seticon	Specifies an icon displayed on the button.
Getbitmap	Retrieves the handle of the bitmap previously called setbitmap.
Setbitmap	Set the bitmap displayed on the button
Getcursor	Retrieve the handle of the cursor image previously called setcursor
Setcursor	Set the cursor image displayed on the button

Covering Functions

Drawitem

It can be overwritten to draw custom cbutton objects.