# Chapter 8 of Part 2 Slider Control Class


---++Brief Introduction of Slider Control
The slider control is mainly visual realization to the adjustment logic of a value. Through dragging and  sliding the control, occasions of the users adjusting the brightness and volume and operation of adjusting the value of a certain range are more visual, avoiding the trouble of keyboard input.

- Hierarchical relation of slider control class

   - [ mWidget ](MStudioMGNCSV1dot0PGENP2C3#mWidget)
         * [ mSlider ](MiniGUIProgGuidePart2Chapter09#mSlider.md)
            * [ mTrackBar ](MiniGUIProgGuidePart2Chapter09#m_TrackBar.md)
            * [ mScrollBar ](MiniGUIProgGuidePart2Chapter09#m_ScrollBar.md)

  * Control creating method
   - Automatic creation: drag corresponding slider control through interface designer in mStudio, and mStudio will automatically create control and provide visual control configuration, and at the same time, creation codes are generated automatically.
   - Manual generation: according to mGNCS control creation process, through programming, corresponding control window class ID is imported and control is generated. Manual programming sets control property and event handling.

---++mSlider

- *Control window class*: NCSCTRL_SLIDER
- *Control English name*: Slider
- *Brief introduction*: Basic class of slider series controls
- *Schematic diagram*: 

*%RED%The control is abstract control and cannot be used directly%ENDCOLOR%*

---+++Style of mSlider

It is inherited from the style of [mWidget](MStudioMGNCSV1dot0PGENP2C3)
| *Style name* | *mStudio property name* | *Explanation* |
| NCSS_SLD_HORIZONTAL | -- | Create horizontal Slider control (default) |
| NCSS_SLD_VERTICAL | -- | Create vertical Slider control |

### Property of mSlider

It is inherited from the property of [mWidget](MStudioMGNCSV1dot0PGP2C3)
| *Property* | *mStudio property name* | *Type* | *RW* | *Explanation* ||
| NCSP_SLD_MAXPOS | -- | int | RW | Set the maximum value of slide range of Slider | Setting of the maximum and minimum values is generally done at initialization |
| NCSP_SLD_MINPOS | -- | int | RW | Set the minimum value of slide range of Slider | ^ |
| NCSP_SLD_CURPOS | -- | int | RW | Set the current location of the slide block ||
| NCSP_SLD_LINESTEP | -- | int | RW | Set step length (direction key) ||
| NCSP_SLD_PAGESTEP | -- | int | RW | Set step length (pageUp/pageDown) ||

### Event of mSlider
It is inherited from the event of [mWidget](MStudioMGNCSV1dot0PGP2C3)
| *Event ID* | *Parameter* | *Explanation* |
| NCSN_SLD_CHANGED | -- | Slide block location changes |
| NCSN_SLD_REACHMAX | -- | The slide block reaches the maximum value |
| NCSN_SLD_REACHMIN | -- | The slide block reaches the minimum value |

### Method of mSlider
It is inherited from the method of [mWidget](MStudioMGNCSV1dot0PGENP2C3)

### Example of mSlider
*%RED%The control is abstract control and cannot be used directly%ENDCOLOR%*

---++mTrackBar
---++mTrackBar

- *Control window class*: NCSCTRL_TRACKBAR
- *Control English name*: Trackbar
- *Brief introduction*: The slide block control adjusts the value within the range
- *Schematic diagram*: 
     <img src="%ATTACHURLPATH%/trackbar.png" alt="trackbar.png" width='205' height='45' />

---+++Style of mTrackBar
It is inherited from the style of [mSlider](MStudioMGNCSV1dot0PGP2C8)
| *Style* | *mStudio property name* | *Explanation* |
| NCSS_TRKBAR_HORIZONTAL | -- | Create horizontal Trackbar control (default) |
| NCSS_TRKBAR_VERTICAL | -- | Create vertical Trackbar control |
| NCSS_TRKBAR_NOTICK | Ruler -> False | Scale is not displayed |
| ^ | Ruler -> True | Scale is displayed |

### Property of mTrackBar
It is inherited from the property of [mSlider](MStudioMGNCSV1dot0PGP2C8)
| *Property name* | *mStudio property name* | *Type* | *RW* | *Explanation* ||
| NCSP_TRKBAR_MAXPOS | MaxPos | int | RW | Set the maximum value of the slide range of Trackbar | Setting of the maximum and minimum values is generally done at initialization |
| NCSP_TRKBAR_MINPOS | MinPos | int | RW | Set the minimum value of the slide range of the Trackbar | ^ |
| NCSP_TRKBAR_CURPOS | CurPos | int | RW | Set the current location of the slide block ||
| NCSP_TRKBAR_LINESTEP | LineStep | int | RW | Set step length (direction key) ||
| NCSP_TRKBAR_PAGESTEP | PageStep | int | RW | Set step length (pageUp/pageDown) ||

### Event of mTrackBar
It is inherited from the event of [mSlider](MiniGUIProgGuidePart2Chapter09.md)
| *Event ID* | *Parameter* | *Explanation* |
| NCSN_TRKBAR_CHANGED | -- | Slide block location changes |
| NCSN_TRKBAR_REACHMAX | -- | The slide block reaches the maximum value |
| NCSN_TRKBAR_REACHMIN | -- | The slide block reaches the minimum value |

### Method of mTrackBar
It is inherited from the method of [mSlider](MiniGUIProgGuidePart2Chapter09.md)

### Renderers of mTrackBar

---++++ mTrackBar Classic Renderer

For the drawing of non client area, please refer to the renderer of [mWidget](MStudioMGNCSV1dot0PGENP2C3#mWidget)
| *Property ID* | *Meaning* | *mStudio property name* | *Value type* | *Schematic diagram of the valid region* | *Value Region* |
| NCS_BGC_3DBODY | Color of slide block and slide rail | ColorBg3DBody | DWORD(ARGB) | <img src="%ATTACHURLPATH%/trackbar-classic-bg3dcolor.png" alt="trackbar-classic-bg3dcolor.png"/>| |
| NCS_BGC_DISABLED_ITEM | Color of the slide block when the control is invalid | ColorBgDisable | DWORD(ARGB) |<img src="%ATTACHURLPATH%/trackbar-classic-bgdisable.png" alt="trackbar-classic-bgdisable.png"/>| |

---++++ mTrackBar Skin Renderer

Refer to [Appendix B : Specification for the Image Resource Used by Skin Renderer](MStudioMGNCSV1dot0PGENAppB#mTrackbar)

---++++ mTrackBar Fashion Renderer

For the drawing of non client area, please refer to the drawing of Fashion renderer of [mWidget](MStudioMGNCSV1dot0PGENP2C3#mWidget)

| *Property ID* | *Meaning* | *mStudio property name* | *Value type* | *Schematic diagram of the valid region* | *Value Region* |
| NCS_BGC_3DBODY | Color of the slide block | ColorBg3DBody | DWORD(ARGB) | <img src="%ATTACHURLPATH%/trackbar-fashion-bg3dcolor.png" alt="trackbar-fashion-bg3dcolor.png"/>| |
| NCS_BGC_DISABLED_ITEM | Color of the slide block when the control is invalid | ColorBgDisable | DWORD(ARGB) |<img src="%ATTACHURLPATH%/trackbar-fashion-bgdisable.png" alt="trackbar-fashion-bgdisable.png"/>| |
| NCS_BGC_TRKBAR_SLIDER | Color of the slide rail | SliderColor | DWORD(ARGB) |<img src="%ATTACHURLPATH%/trackbar-fashion-slider.png" alt="trackbar-fashion-slider.png" />| |
| NCS_METRICS_3DBODY_ROUNDX | Round corner X radius of the slide block | ThumbRoundX | int | | 0 ~ 1/2 of the window width |
| NCS_METRICS_3DBODY_ROUNDY | Round corner Y radius of the slide block | ThumbRoundY | int| | 0 ~ 1/2 of the window height |

---++++ mTrackBar Flat Renderer
For the drawing of non client area, please refer to the drawing of Flat renderer of [mWidget](MStudioMGNCSV1dot0PGENP2C3#mWidget)

| *Property ID* | *Meaning* | *mStudio property name* | *Value type* | *Schematic diagram of the valid region* | *Value range* |
| NCS_FGC_3DBODY | Color of the slide block side | ColorFg3DBody | DWORD(ARGB) | <img src="%ATTACHURLPATH%/trackbar-flat-fgc.png" alt="trackbar-flat-fgc.png"/> | |
| NCS_BGC_3DBODY | Color of the slide block | ColorBg3DBody | DWORD(ARGB) | Same as Classic renderer | |

### Example of mTrackBar

<p align=center>
<img src="%ATTACHURLPATH%/trackbar-sample.png" alt="trackbar-sample.png"/><br>
Figure p2c8-1 Example of trackbar
</p>

<p align=center>List p2c8-1 trackbar.c</p>
```cplusplus
%INCLUDE{"%ATTACHURL%/trackbar.c.txt"}%
```

---++mScrollBar

- *Control window class*: NCSCTRL_SCROLLBAR
- *Control English name*: Scrollbar
- *Brief introduction*: Slide block that can be dragged, commonly used for window content display adjustment
- *Schematic diagram*: 
<img src="%ATTACHURLPATH%/scrollbar.png" alt="scrollbar.png"/>

---+++Style of mScrollBar

It is inherited from the style of [mSlider](MiniGUIProgGuidePart2Chapter09.md)
| *Style* | *mStudio property name* | *Explanation* |
| NCSS_SCRLBR_HORIZONTAL | -- | Create horizontal scrollbar control (default) |
| NCSS_SCRLBR_VERTICAL | -- | Create vertical scrollbar control |
| NCSS_SCRLBR_ARROWS | HaveArrows | Mark if a scroll bar has arrow |
| NCSS_SCRLBR_LEFTDBLARROWS | DoubleArrows -> Left | Mark if a scroll bar has left double arrows (mutually exclude with NCSS_SCROLLBAR_RIGHTDBLARROWS) |
| NCSS_SCRLBR_RIGHTDBLARROWS | DoubleArrows -> Right | Mark if a scroll bar has right double arrows (mutually exclude with NCSS_SCROLLBAR_LEFTDBLARROW) |
| NCSS_SCRLBR_UPDBLARROWS | DoubleArrows -> Up | Mark if a scroll bar has up arrow (mutually exclude with NCSS_SCROLLBAR_DOWNDBLAROWS)|
| NCSS_SCRLBR_DOWNDBLAROWS | DoubleArrows -> Down |Mark if a scroll bar has down arrow (mutually exclude with NCSS_SCROLLBAR_DUPDBLAROWS)|


### Property of mScrollBar
It is inherited from the property of [mSlider](MStudioMGNCSV1dot0PGP2C8)
| *Property name* | *mStudio property name* | *Type* | *RW* | *Explanation* ||
| NCSP_SCRLBR_MAXPOS | MaxPos | int | RW | Set the maximum value of the slide range of scrollbar| Setting of maximum and minimum values is generally done at initialization |
| NCSP_SCRLBR_MINPOS | MinPos | int | RW | Set the minimum value of the slide range of scrollbar | ^ |
| NCSP_SCRLBR_CURPOS | CurPos | int | RW | Set current location of the slide block ||
| NCSP_SCRLBR_LINESTEP | LineStep | int | RW | Set step length (direction key) ||
| NCSP_SCRLBR_PAGESTEP | PageStep | int | RW | Set step length (pageUp/pageDown) ||

### Event of mScrollBar
It is inherited from the event of [mSlider](MStudioMGNCSV1dot0PGP2C8)
| *Event ID* | *Parameter* | *Explanation* |
| NCSN_SCRLBR_CHANGED | -- | Slide block location changed |
| NCSN_SCRLBR_REACHMAX | -- | The slide block reaches the maximum value |
| NCSN_SCRLBR_REACHMIN | -- | The slide block reaches the minimum value |


### Method of mScrollBar
It is inherited from the method of [mSlider](MStudioMGNCSV1dot0PGP2C8)

### Renderer of mScrollBar

---++++ mScrollBar Classic Renderer

For the drawing of non client area, please refer to the renderer of [mWidget](MStudioMGNCSV1dot0PGENP2C3#mWidget)

| *Property ID* | *Meaning* | *mStudio property name* | *Value type* | *Schematic diagram of the valid region* | *Value Range* |
| NCS_BGC_3DBODY | Background color of the control  | BgColor | DWORD(ARGB) | <img src="%ATTACHURLPATH%/scrollbar-classic-bg3dcolor.png" alt="scrollbar-classic-bg3dcolor.png"/>| |
| NCS_BGC_DISABLED_ITEM | Color of the slide block and arrow button when the control is invalid | ColorBgDisable | DWORD(ARGB) |<img src="%ATTACHURLPATH%/scrollbar-classic-bgdisable.png" alt="scrollbar-classic-bgdisable.png"/>| |
| NCS_FGC_3DBODY | Color of the button up arrow | ArrowColor | DWORD(ARGB) | <img src="%ATTACHURLPATH%/scrollbar-classic-fg3dcolor.png" alt="scrollbar-classic-fg3dcolor.png"/>| |
| NCS_FGC_DISABLED_ITEM | Color of the arrow when the button is invalid | ArrowColorDisable | DWORD(ARGB) | <img src="%ATTACHURLPATH%/scrollbar-classic-fgdisable.png" alt="scrollbar-classic-fgdisable.png"/>| |

---++++ mScrollBar Skin Renderer

Refer to [Appendix B : Specification for the Image Resource Used by Skin Renderer](MStudioMGNCSV1dot0PGENAppB#mTrackbar)

---++++ mScrollBar Fashion Renderer

For the drawing of non client area, please refer to the drawing of Fashion renderer of [mWidget](MStudioMGNCSV1dot0PGENP2C3#mWidget)

| *Property ID* | *Meaning* | *mStudio property name* | *Value type* | *Schematic diagram of the valid region* | *Value Range* |
| NCS_BGC_3DBODY | Color of the slide block and button | ColorBg3DBody | DWORD(ARGB) | <img src="%ATTACHURLPATH%/scrollbar-fashion-bg3dcolor.png" alt="scrollbar-fashion-bg3dcolor.png"/>| |
| NCS_BGC_DISABLED_ITEM | Color of the slide block and arrow button when the control is invalid | ColorBgDisable | DWORD(ARGB) | Same as Classic renderer | |
| NCS_BGC_WINDOW | Color of the slide rail | ColorBgWindow | DWORD(ARGB) | <img src="%ATTACHURLPATH%/scrollbar-fashion-slider.png" alt="scrollbar-fashion-slider.png" /> | |
| NCS_FGC_DISABLED_ITEM | Color of the arrow when the button is invalid | ArrowColorDisable | DWORD(ARGB) | Same as Classic renderer  | |
| NCS_METRICS_3DBODY_ROUNDX | Round corner X radius of the slide block | RoundX | int | | 0 ~ 1/2 of the window width |
| NCS_METRICS_3DBODY_ROUNDY | Round corner Y radius of the slide block | RoundY | int| | 0 ~ 1/2 of the window height |
| NCS_MODE_BGC | Gradual change fill mode | GradientMode | int |<img src="%ATTACHURLPATH%/scrollbar-fashion-bg3dcolor.png" alt="scrollbar-fashion-bg3dcolor.png" />| [GradientMode](MStudioMGNCSV1dot0PGP2C5#GrandientMode) |
| | | | | <img src="%ATTACHURLPATH%/scrollbar-fashion-vert.png" alt="scrollbar-fashion-vert.png" />| |

---++++ mScrollBar Flat Renderer
For the drawing of non client area, please reefer to the drawing of Flat renderer of [mWidget](MStudioMGNCSV1dot0PGENP2C3#mWidget)

| *Property ID* | *Meaning* | *mStudio property name* | *Value type* | *Schematic diagram of the valid region* | *Value range* |
| NCS_FGC_3DBODY | Color of the slide block and button side | ColorFg3DBody | DWORD(ARGB) | <img src="%ATTACHURLPATH%/scrollbar-flat-fgc.png" alt="scrollbar-flat-fgc.png"/> | |
| NCS_BGC_3DBODY | Background color of the control | ColorBg3DBody | DWORD(ARGB) | <img src="%ATTACHURLPATH%/scrollbar-flat-bgc.png" alt="scrollbar-flat-bgc.png"/> | |

### Example of mScrollbar

<p align=center>
<img src="%ATTACHURLPATH%/scrollbar-sample.png" alt="scrollbar-sample.png"/><br>
Figure p2c8-2 Example of scrollbar

</p>

<p align=center>List p2c8-2 scrollbar.c</p>

```cplusplus
%INCLUDE{"%ATTACHURL%/scrollbar.c.txt"}%
```

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