JPH09244864A - Control fast drawing system for gui application - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display plural controls together at a time while event procedures are described in the respective controls in a form which has the controls. SOLUTION: This system is equipped with a prepaint method 3 which draws the controls included in the form to be displayed on a memory device 4 in form units while the event procedures described in the controls are held, and the form to be displayed is read out of the memory device 4 and drawn, so that the controls included in the form are displayed together at a time while having the event procedures.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing a control at high speed when switching a form of a GUI application.

[0002]

2. Description of the Related Art In a GUI application, an event procedure is activated in response to an event such as mouse or keyboard input or timer interrupt. This is called event-driven. In event-driven programming, you place controls on a form and write an event procedure for each control. A form is a generic term for windows and dialogs, and a control is an object that has a series of properties indicating attributes and is arranged on a form that recognizes an event.

Controls include a graphical control that is displayed on a form such as a text box and a control that is not displayed like a timer. Drawing of all graphical controls is performed in response to the drawing request message. The drawing request message is displayed when the form is opened or when the form is moved.
O when you can see the hidden form
There are cases where S is generated, and cases where S is generated indirectly by calling a redrawing function (method).

Although the control is drawn in this manner, the drawing request message is issued to each control. Since the messages are processed in the queue sequentially, the drawing of the control is also performed sequentially. Therefore, when a large number of graphical controls are provided on the form, the controls are sequentially displayed, which causes a problem that it takes time to display the controls and the controls are not smoothly performed.

In order to avoid this phenomenon, conventionally, a method has been adopted in which a plurality of screen objects such as buttons are realized by one control. For example, when the form requires n buttons, one image control having an image in which n buttons are arranged is prepared. In one drawing process for this image control, n buttons are simultaneously drawn.

However, in this case, since there is no control corresponding to each button, the mouse event such as a click is received by the image control. Therefore, if it is a click, it is necessary to create a click event procedure that calculates the specified button from the click position and performs the processing when the button is pressed, and describe it in the image control. Simulates n buttons.

[0007]

As described above, in the case of a form having n buttons, by preparing an image control having an image in which n buttons are arranged, the image control can be performed once for this image control. In the drawing process, n buttons can be displayed all at once.

However, in this method, although the display is performed smoothly, there is a problem that the goodness of the event driven programming using the control is sacrificed. That is, the application program must implement the functions provided by the control in advance. For example, a process that changes like a button being pressed when clicked must be newly created as an image control event procedure and described in the image control.

Further, the layout of the controls is not customizable. For example, if there is a change in the button layout,
The process of calculating the specified button must be modified for the new layout.

[0010]

In order to solve the above-mentioned problems, the present invention provides a memory device in a form unit with a control included in a form to be displayed while having an event procedure described in the control. A prepainting method for drawing on top is provided, and a form to be displayed is called from the memory device and drawn, so that the controls included in the form are displayed all together with an event procedure.

[0011]

1 is a block diagram showing an example of an embodiment of a control high-speed drawing system of a GUI application of the present invention. Form 2 has as many controls 2 as the number of screen objects. When there are n screen objects in a certain form m, n control 2 corresponding to them are prepared. here,
A predetermined event procedure is described in each control 2. A required number of such forms are created and stored in a hard disk or the like.

In order to display a certain form m, when the corresponding form m is loaded from the hard disk or the like, the prepaint method 3 is called for all the controls 2 on this form m, and the form m to be displayed is The screen when activated is built on the memory device 4 by this prepainting method 3. Here, the prepaint method 3 is the memory device 4
Is used as a virtual screen to draw the control 2, and the event procedure described in each control 2 is also expressed on the memory device 4 in accordance with the control 2. When there are a plurality of forms to be displayed, a screen when each form is activated is constructed on the memory device 4 for each form.

As described above, when the drawing process to the memory device 4 is provided in the form of a method, the drawing control attributes such as the position of the control, the color and the font are managed by the property, so that the property may be changed. However, the method call is not affected. This allows the programmer to program without worrying about the properties of the control, allowing the programming to be independent of the form design.

The display of the form m is performed by drawing on the screen 5 an image of the corresponding form m constructed on the memory device 4 including the control 2.
At this time, the drawing method 6 calls an image for each form 1 from the memory device 4 and draws it on the screen, but each form 1 has a control 2 belonging to the form 1.
Therefore, when a certain form m is displayed on the screen, the controls 2 included in the form m are displayed all at once. In the past, since a control was drawn on the screen when the form became active, the phenomenon that the controls appeared one after another occurred. However, in the present embodiment, the control is performed on the memory device 4 before the form 1 becomes active. Since the display image of the form 1 including 2 is prepared, it is possible to display all the controls 2 at once.

At this time, since a predetermined event procedure is described in each control 2, each control 2 normally processes the mouse event after the display of the form 1, and the control simulation by the application is unnecessary. is there.

[0016]

As described above, the present invention provides a GUI.
A prepaint method is prepared for the graphical control that is a component of the application to build a display image of the form that includes the control in the memory device before displaying the form. When displaying the form, the form is displayed on the memory device. Since it was decided to draw the display image of the constructed form on the screen, even if there are multiple controls, they can be displayed all at once.

Further, since the event procedure is described in each control, the function provided in advance by the control can be utilized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an embodiment of a control high-speed drawing system of a GUI application of the present invention.

[Explanation of symbols]

 1 Form 2 Control 3 Prepainting method 4 Memory device

Claims (1)

[Claims] 1. A prepainting method for drawing a control included in a form to be displayed on a memory device on a form-by-form basis with the event procedure described in the control being provided, and the form to be displayed is described above. A high-speed drawing method for a control of a GUI application, which is characterized in that the controls included in the form are displayed all at once with an event procedure by calling and drawing from the memory device.