The TrackBar component is a control in the form of a slider.
Slider position can be changed using the mouse cursor or the keyboard. The current value is tracked in the OnChange event. To manage slider position, use the Position property. Value of the TickMarks property determines the scale position relative to the component. The Orientation property determines slider orientation. Value of the TickStyle property determines a scale representation method.
The LineSize and PageSize properties determine the slider offset when the user moves the slider by the arrow keys or the PAGE UP and the PAGE DOWN keys.
Set the values to the SelStart and SelEnd properties and visually highlight the scale range, which can be a recommended value range. At the same time, nothing prevents the user from moving the slider beyond this range.
| Property name | Brief description | |
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Align | The Align property determines behavior of the component when its parent component is resized. |
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AllowDrag | The AllowDrag property determines whether an object can be dragged from the component. |
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AllowDrop | The AllowDrop property determines whether the component can accept a dragged object. |
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Anchors | The Anchors property returns settings that determine the percentage of the size change for the current component when the parent component is resized. |
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BorderStyle | The BorderStyle property determines a component border style. |
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Brush | The Brush property determines the brush that is used to fill component area. |
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ClientHeight | The ClientHeight property is used to receive or specify the height of the component’s client area. |
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ClientWidth | The ClientWidth property is used to receive or specify the width of the component’s client area. |
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Color | The Color property determines a component background color. |
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ComponentCount | The ComponentCount property returns the number of child components. |
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Components | The Components property returns the child component. |
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Cursor | The Cursor property determines the look of the cursor over the component. |
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Data | The Data property is used to store any custom data. |
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Enabled | The Enabled property determines whether the component is available for the user. |
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Focused | The Focused property returns True if the focus is set on the component. |
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Font | The Font property determines the set of characteristics describing the font that is used to display text. |
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Frequency | The Frequency property determines the value used on calculating the number of intervals and location of component area's ticks. |
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Height | The Height property determines component height. |
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HelpContext | The HelpContext property determines a unique index for the context help section for this component. |
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Hint | The Hint property determines a component tooltip text. |
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Left | The Left property determines the coordinate of the left border of the component. |
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LineSize | The LineSize property determines how much the slider is shifted on clicking arrow buttons. |
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Max | The Max property determines the maximum value of the change range. |
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Min | The Min property determines the minimum value of the change range. |
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Name | The Name property determines a component name. |
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Orientation | The Orientation property determines component orientation on the form. |
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PageSize | The PageSize property determines how much the slider is shifted on pressing PAGE UP and PAGE DOWN buttons, or on clicking the edge of the scale. |
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Parent | The Parent property determines a parent component. |
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ParentColor | The ParentColor property determines whether the component inherits the color of the parent component. |
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ParentFont | The ParentFont property determines whether the component uses the font of the parent component. |
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ParentShowHint | The ParentShowHint property determines whether a tooltip is displayed. |
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PopupMenu | The PopupMenu property determines the context menu to be displayed on right-click on the component. |
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Position | The Position property determines the current slider position. |
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Scrolls | The Scrolls property returns parameters of component's scrollbars. |
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SelEnd | The SelEnd property determines the end selection position. |
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SelStart | The SelStart property determines the start selection position. |
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ShowHint | The ShowHint property enables and disables showing a component tooltip. |
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SliderVisible | The SliderVisible property determines whether the component slider is visible. |
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TabOrder | The TabOrder property determines the component position in the tab order. |
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TabStop | The TabStop property determines whether the component is focused when the TAB key is pressed. |
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Tag | The Tag property is not used by the compiler. The user can change the value of the Tag property and use it as he wishes. |
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Text | The Text property determines the row identifying a component for the user. |
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ThumbLength | The ThumbLength property determines slider length. |
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TickMarks | The TickMarks property determines how tick marks are set. |
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TickStyle | The TickStyle property determines a style of setting tick marks. |
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Top | The Top property determines the coordinate of the top border of the component. |
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Visible | The Visible property determines visibility of the component during execution. |
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Width | The Width property determines component width. |
| Method name | Brief description | |
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BringToFront | The BringToFront method brings a component to front. |
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ClientToScreen | The ClientToScreen method converts the coordinates of a point specified relative to the component coordinate system into screen coordinates. |
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DoDragDrop | The DoDragDrop method enables the user to start dragging operation. |
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GetImage | The GetImage method returns the image of the component with all the child components. |
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ScreenToClient | The ScreenToClient method converts screen coordinates of a point into coordinates specified relative to the component coordinate system. |
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SendToBack | The SendToBack method sends a component to back. |
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SetFocus | The SetFocus method sets focus to this component. |
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SetTick | The SetTick method sets a tick mark in the specified position. |
| Event name | Brief description | |
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OnBeginDrag | The OnBeginDrag event occurs for a component when the user starts to drag an object from the component. |
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OnChange | The OnChange event occurs when the slider position changes. |
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OnClick | The OnClick event occurs if the user clicks the component area with the main mouse button. |
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OnDblClick | The OnDblClick event occurs if the user double-clicks a component area with the mouse button. |
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OnDragDrop | The OnDragDrop event occurs for the component if the user drops a dragged object over it. |
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OnDragEnter | The OnDragEnter event occurs when a dragged object crosses the borders of this component. |
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OnDragLeave | The OnDragLeave event occurs when a dragged object leaves the borders of this component. |
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OnDragOver | The OnDragOver event occurs for the component when the user drags an object over it. |
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OnEnter | The OnEnter event occurs when the component receives focus. |
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OnExit | The OnExit event occurs when the component loses focus. |
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OnHScroll | The OnHScroll event occurs when horizontal scrollbar slider changes its position. |
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OnKeyDown | The OnKeyDown event occurs if the component is focused and the keyboard key is pressed. |
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OnKeyPress | The OnKeyPress event occurs if the component is focused when the user presses a character key. |
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OnKeyPreview | The OnKeyPreview event occurs prior to each event related to key pressing. |
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OnKeyUp | The OnKeyUp event occurs if the component is focused and the user releases any button previously pressed. |
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OnMouseDown | The OnMouseDown event occurs if the pointer is in component's area and a mouse key is pressed. |
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OnMouseEnter | The OnMouseEnter event occurs when mouse cursor enters the component area. |
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OnMouseHover | The OnMouseHover event occurs when mouse cursor is held in the component area. |
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OnMouseLeave | The OnMouseLeave event occurs when mouse cursor leaves the component area. |
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OnMouseMove | The OnMouseMove event occurs on moving the cursor over component. |
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OnMouseUp | The OnMouseUp event occurs on releasing mouse button when the cursor is in component area. |
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OnMouseWheel | The OnMouseWheel event occurs if the component is focused when the mouse wheel is rotated. |
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OnVScroll | The OnVScroll event occurs when vertical scrollbar slider changes its position. |
See also: