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Chapter 7 of Part 2 Container and Its Derived Class
Brief Introduction of Container Class Control
This class of control is the container class control accommodating other classes of controls, and the difference from panel class control is that this class of control provides default window scroll processing.
Class inheritance relation of the window and its derived class is as below:
mScrollWidget
- Control name:
NCSCTRL_SCROLLWIDGET - English name:
ScrollWidget - Brief introduction: All abstract basic classes including scroll function control class
- Schematic diagram: %RED%Abstract class, cannot be used directly%ENDCOLOR%
Style of mScrollWidget
It is inherited from the style of mWidget.
Property of mScrollWidget
It is inherited from the property of mWidget.
| Property ID | miniStudio name | Type | Permission | Explanation |
| NCSP_SWGT_CONTWIDTH | - | unsigned int | RW | Content width |
| NCSP_SWGT_CONTHEIGHT | - | unsigned int | RW | Content height |
| NCSP_SWGT_CONTX | ContentX | int | RW | Offset value of the content in horizontal direction |
| NCSP_SWGT_CONTY | ContentY | int | RW | Offset value of the content in vertical direction |
| NCSP_SWGT_HSTEPVALUE | HStepValue | unsigned int | RW | Horizontal step value when scrolling content |
| NCSP_SWGT_VSTEPVALUE | VStepValue | unsigned int | RW | Vertical step value when scrolling content |
| NCSP_SWGT_VISWIDTH | - | unsigned int | RW | Width of the visible region |
| NCSP_SWGT_VISHEIGHT | - | unsigned int | RW | Height of the visible region |
| NCSP_SWGT_MARGINRECT | - | unsigned int | RW | Boundary rectangle |
| NCSP_SWGT_DRAWMODE | ScrollBarMode | ncsSwgtDrawMode | RW | Display mode of the scroll bar |
Event of mScrollWidget
It is inherited from the event of mWidget.
Method of mScrollWidget
It is inherited from the method of mWidget.
All the methods of ScrollWidget? are provided for the child class to use,
please avoid using the class interface in the concrete control application.
Coordinate Transformation Related Method
When handling scrolled window content, three kinds of coordinates are involved:
- content: coordinate with the appointed content in all the content.
- viewpoint: coordinate with the appointed content in the visible region. Influenced by the content scroll.
- window: display coordinate with the appointed content in the window. Influenced by margin region.
Content is the original coordinate of the display content, and window is the coordinate in MiniGUI window. If you want to convert a content coordinate of the original content to window coordinate for display use, transformation is needed between the two, that is, it is necessary to firstly transform the content coordinate to viewpoint coordinate. It is like content of several pages, if displaying the content of a certain page as the current content, coordinate of a certain part of the page will start from the starting position comparative to the overall content to the starting position comparative to the page. When finally displaying the content to the window, it is necessary to carry out further transformation from viewpoint to window. That is because in the client area of the window, often a part of margin will be added to adjust the display effect. On the contrary, to transform the position of the content displayed in MiniGUI window to the position in all the content, reversed two steps of work are necessary.
Relation schematic diagram of the three kinds of coordinates:
Corresponding interface of transformation between the three kinds of coordinates are:
void contentToViewport(mScrollWidget *self, int *x, int *y);
void viewportToWindow(mScrollWidget *self, int *x, int *y);
void contentToWindow(mScrollWidget *self, int *x, int *y);
void windowToViewport(mScrollWidget *self, int *x, int *y);
void viewportToContent(mScrollWidget *self, int *x, int *y);
void windowToContent(mScrollWidget *self, int *x, int *y);
Initialization Related Method
ScrollWidget control class configures margin as all 0 value by default. When
the child class based on the control class needs to be configured with margin
different from the parent class, initMargins method can be used in
constructor function to configure again.
void initMargins(mScrollWidget *self, int l, int t, int r, int b);
Iconview control class in construct method uses the following codes to initialize the margin of top, bottom, left and right, and the values are all 5.
_c(self)->initMargins(self, 5, 5, 5, 5);
Refreshment Related Method
When automatically adjusting the scroll bar region and setting configuration
related to the display region, ScrollWidget needs to refresh the screen. In
order to meet processing need of different controls, two callbacks are provided
for the convenience of upper layer control processing. At the same time,
ScrollWidget also provides realization of default processing:
void moveContent(mScrollWidget *self);
void refreshRect(mScrollWidget *self, const RECT *rc);
moveContentis mainly used for the update after scrolling content, such as full screen refreshment after scrolling the window.refreshRectis used to refresh the content of the appointed region.
Method to Getting Information
ScrollWidget provides isVisible method for child class to judge if a
certain content position is visible in the current display region, so as to
make the child class judge if operations such as screen scrolling etc. are
necessary. At the same time, when the child class is carrying out content
drawing, the content needs to be drawn in the appointed visible region.
getVisRect method provides convenience for getting the maximum range of
permissible drawing.
BOOL (*isVisible)(mScrollWidget *self, int x, int y);
void (*getVisRect)(mScrollWidget *self, RECT *rcVis);
isVisibleis used to judge if the appointed content position is currently in the visible region.getVisRectis used to get the current visible region.
Setting Related Method
ScrollWidget and its derived class needs to carry out corresponding setting
to different information when the window size changes or the content changes,
therefore ScrollWidget provides the following methods:
void resetViewPort(mScrollWidget *self, unsigned int visW,unsigned int visH);
void setScrollInfo(mScrollWidget *self, BOOL reDraw);
BOOL makePosVisible(mScrollWidget *self, int x, int y);
resetViewportis used to readjust the size of the visible region. When the window size changes, it is necessary to use the interface to adjust the visible region.setScrollInfomethod is provided for child class control to use. When the size of the visible region or the content region changes, carry out corresponding scroll bar information setting.makePosVisibleis used to automatically display the appointed content position in the visible region.
Renderer of mScrollWidget
It is inherited from renderer of mWidget
mScrollWidget does not have newly added renderer method.
mContainer
- Control name:
NCSCTRL_CONTAINER - English name: Container
- Brief introduction: Container class control with scroll support
Style of mContainer
It is inherited from the style of styleofmScrollWidget`.
Property of mContainer
It is inherited from the propertyofmScrollWidget`.
Event of mContainer
It is inherited from the eventofmScrollWidget`.
Method of mContainer
It is inherited from the methodofmScrollWidget`.
Method of Adding Controls
Container provides support to mGNCS control and MiniGUI intrinsic control. If
it is necessary to add a group of mGNCS controls to Container, addChildren
method inherited from mWidget class can be used.
BOOL addChildren(mContainer *self, NCS_WND_TEMPLATE* children, int count);
%INCLUDE{"%ATTACHURL%/container.c.txt" pattern="^.*?// START_OF_NCSCTRLS(.*?)// END_OF_NCSCTRLS.*"}%
To add a group of MiniGUI intrinsic controls to Container,
addintrinsicControls method can be used:
BOOL addIntrinsicControls(mContainer *self, const PCTRLDATA pCtrl, int nCount);
%INCLUDE{"%ATTACHURL%/container.c.txt" pattern="^.*?// START_OF_INTRINSICCTRLS(.*?)// END_OF_INTRINSICCTRLS.*"}%
Focus Related Method
In Container, it is often necessary to set and get the current focus control, the two methods below are provided for this:
HWND setFocus(mContainer *self, int id);
HWND getFocus(mContainer *self);
setFocussets focus control through controlID.getFocusgets the sentence handle of the current focus control.
Other Methods
Container provides adjustContent method to allow the application to carry out
the function of adjusting its own size through its content instead of
displaying range through Container control control. getPanel method can get
the hosting window sentence handle of the current Container content.
HWND getPanel(mContainer *self);
void adjustContent(mContainer *self);
Renderer of mContainer
It is inherited from the rendererofmScrollWidget`.
mContainer does not have newly added renderer method.
Example of mContainer
This example demonstrates how to use Container to realize jumping between multiple controls exceeding the window size to the users.
Figure p2c6-1 Output of Container Program
List 1 container.c
%INCLUDE{"%ATTACHURL%/container.c.txt"}%
mPage
- Control name:
NCSCTRL_PAGE - English name: Page
- Brief introduction: Property page control, used to display same class information and window content.
Style of mPage
It is inherited from styleof mContainer`.
Property of mPage
It is inherited from propertyof mContainer`.
Event of mPage
It is inherited from eventof mContainer`.
Method pf mPage
It is inherited from methodof mContainer`.
Renderer of mPage
It is inherited from rendererofmContainer`.
mPage does not have newly added renderer method
Example of mPage
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-- Main.XiaodongLi - 28 Feb 2010
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