PtDivider
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PtDivider
A container that divides space among its children
Class hierarchy:
PtWidget --> PtBasic --> PtContainer --> PtCompound --> PtDivider
For more information, see the diagram of the widget hierarchy.
PhAB icon:
Public header:
<photon/PtDivider.h>
Description:
The PtDivider widget is a container that lays out its children like a one-row or one-column PtGroup widget, but lets you resize the children by dragging "handles" placed between the children.
Two PtDivider widgets: one contains two lists, the other contains some buttons.
The PtDivider class inherits resources from the PtGroup class. Access to these resources is controlled through PtDivider's exporting mechanism.
A blocking mechanism lets PtDivider block the inheritance of certain resources from its subordinate PtGroup widget. This prevents any actions that would negatively affect the look and behavior of a PtDivider widget. For more information, see the "Exported subordinate children" section.
New resources:
| Resource | C type | Pt type | Default |
|---|---|---|---|
| Pt_ARG_DIVIDER_FLAGS | unsigned short | Flag | Pt_DIVIDER_RESIZE_BOTH |
| Pt_ARG_DIVIDER_OFFSET | short | Scalar | 0 |
| Pt_ARG_DIVIDER_SIZES | PtDividerSizes_t *, short | Array | NULL, 0 (read-only) |
| Pt_CB_DIVIDER_DRAG | PtCallback_t * | Link | NULL |
Pt_ARG_DIVIDER_FLAGS
| C type | Pt type | Default |
|---|---|---|
| unsigned short | Flag | Pt_DIVIDER_RESIZE_BOTH |
Possible values:
- Pt_DIVIDER_NORESIZE
- Don't resize the children, just invoke the callback.
- Pt_DIVIDER_RESIZE_BOTH
- Resize both widgets: the one to the left and to the right (or above and below) the dragged handle. If this flag isn't set, only the left child is resized and the right child is moved.
- Pt_DIVIDER_INVISIBLE
- Never display the drag outline. This flag is useful mainly when Pt_DIVIDER_NORESIZE is also set.
Pt_ARG_DIVIDER_OFFSET
| C type | Pt type | Default |
|---|---|---|
| short | Scalar | 0 |
This number is added to positions of child widgets (relative to the position of the PtDivider widget) when the values for the Pt_ARG_DIVIDER_SIZES resource are calculated. By setting Pt_ARG_DIVIDER_OFFSET, you can make the Pt_ARG_DIVIDER_SIZES relative to any arbitrary point.
Pt_ARG_DIVIDER_SIZES (read-only)
| C type | Pt type | Default |
|---|---|---|
| PtDividerSizes_t *, short | Array | NULL, 0 |
The array of positions and sizes of realized children of the divider. Each PtDividerSizes_t structure contains:
- short from
- The left side or top of the child, depending on the divider's orientation.
- short to
- The right or bottom of the child, depending on the divider's orientation.
Pt_CB_DIVIDER_DRAG
| C type | Pt type | Default |
|---|---|---|
| PtCallback_t * | Link | NULL |
A list of PtCallback_t structures that define the callbacks that are invoked when the widget receives a drag event.
If the widget has the Pt_CALLBACKS_ACTIVE bit set in its Pt_ARG_FLAGS resource, these callbacks are also invoked when your application changes the size of a child by calling PtSetResource() or PtSetResources().
Each callback is passed a PtCallbackInfo_t structure that contains at least the following members:
- reason
- Pt_CB_DIVIDER_DRAG
- reason_subtype
- The subtype of the drag event (see Ph_EV_DRAG in the description of the PhEvent_t structure in the Photon Library Reference), or Pt_CB_DIVIDER_SETRESOURCES if a child is being resized through PtSetResources() and the widget has the Pt_CALLBACKS_ACTIVE bit set in its Pt_ARG_FLAGS resource.
- event
- A pointer to a PhEvent_t structure that describes the received drag event, or NULL if a child is being resized through a call to PtSetResources().
- cbdata
-
A pointer to a
PtDividerCallback_t structure that contains at least
the following members:
- PtWidget_t *left, *right;
- The two widgets in the group separated by the divider.
- int moved;
- How far the widget on the right has been moved.
- int resized;
- The amount by which the widget on the left has been resized.
- PtDividerSizes_t const *sizes;
- The new value of the Pt_ARG_DIVIDER_SIZES resource.
- int nsizes;
- The number of items in the sizes array.
These callbacks should return Pt_CONTINUE.
Exported subordinate children:
Unless the resources are already defined in PtDivider, the PtDivider class uses the resources of its exported subordinate child, PtGroup.
Where PtDivider and PtGroup both define resources having the same name, the resource defined in PtDivider takes precedence.
Inherited resources:
If PtDivider modifies an inherited resource, the "Default override" column indicates the new value. If PtDivider inherits a resource from PtGroup, the default value assigned by PtGroup is inherited too; the "Default override" column shows this default value.
Pt_ARG_BANDWIDTH_THRESHOLD
Defines the "graphics bandwidth" threshold that determines whether the widget resizes the children after each received drag event or only once, when the drag is completed -- see PtQuerySystemInfo().
Pt_ARG_GROUP_ORIENTATION
The value of this resource can be only Pt_GROUP_HORIZONTAL or Pt_GROUP_VERTICAL.
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