TrackHeadWidget Class Reference

#include "stage/timeline/track-head-widget.hpp"

Description

Header pane control area corresponding to a Track with nested child Tracks.

This structure is used recursively to build up the Fork of nested Tracks.

• first row: Placement + Property pane
• second row: content or nested tracks.

  Todo:

  WIP-WIP as of 12/2016

Definition at line 80 of file track-head-widget.hpp.

Public Member Functions
void	accommodateContentHeight (uint)
void	accommodateOverallHeight (uint)
uint	getContentHeight () const
uint	getOverallHeight () const
void	setTrackName (cuString &)
void	syncSubtrackStartHeight (uint)
	The first part of each track's display relates to the direct content; below that area, the content of sub-tracks may be added. More...
Public Member Functions inherited from ViewHook< TrackHeadWidget >
virtual	~ViewHook ()
	this is an interface
virtual void	hook (TrackHeadWidget &widget)=0
virtual void	rehook (TrackHeadWidget &widget) noexcept=0
virtual void	remove (TrackHeadWidget &widget)=0
void	reOrder (IT newOrder)
	re-attach elements in a given, new order. More...

Private Member Functions
void	attachSubFork (TrackHeadWidget &subForkHead)
	Integrate the control area for a nested sub track fork. More...
void	clearFork ()
	Discard all nested sub track display widgets. More...
void	detachSubFork (TrackHeadWidget &subForkHead)
void	enforceContentHeight (uint h)
void	enforceExpansionHeight (uint h)
void	enforceHeightAt (int left, int top, uint height)
void	enforceSyncPadHeight (uint h)
uint	getExpansionHeight () const
uint	getHeightAt (int left, int top) const
	get the height allocated at cell(x,y)
uint	getLabelHeight () const
uint	getSyncPadHeight () const
void	hook (TrackHeadWidget &) override
void	linkSubTrackPositions (uint)
	Coordinate the exact positions of sub-Track start during DisplayEvaluaton. More...
void	rehook (TrackHeadWidget &) noexcept override
void	remove (TrackHeadWidget &) override

Private Attributes
uint	childCnt_
HeadControlArea	headCtrl_
Gtk::Box	padding_
StaveBracketWidget	structure_
widget::ElementBoxWidget	trackName_

Member Function Documentation

rehook()

void rehook ( TrackHeadWidget &  hookedSubHead )

overrideprivatenoexcept

Remarks

This implementation will not interfere with the widget's lifecycle. The widget with all its children is just detached from presentation (leaving an empty grid cell), and immediately re-attached into the "bottom most" cell, as given by the current childCnt_

Note

in theory it is possible to end up with several widgets in a single cell, and GTK can handle that. Given our actual usage of these functions, such should never happen, since we manage all widgets as slave of the model::Tangible in charge.

Definition at line 283 of file track-head-widget.cpp.

getContentHeight()

uint getContentHeight ( ) const

inline

Remarks

the cell(1,1) is guaranteed to exist; it may be empty, or hold the placement controls for this track's scope.

Definition at line 138 of file track-head-widget.hpp.

syncSubtrackStartHeight()

void syncSubtrackStartHeight

(

uint

directHeight

)

The first part of each track's display relates to the direct content; below that area, the content of sub-tracks may be added.

This function possibly adds further padding to shift the sub-track headers down to correspond to the display of the sub track body content.

Parameters

directHeight

the vertical space to use for direct content

Definition at line 167 of file track-head-widget.cpp.

attachSubFork()

void attachSubFork ( TrackHeadWidget &  subForkHead )

private

Integrate the control area for a nested sub track fork.

Remarks

The Lumiera Timeline model does not rely on a list of tracks, as most conventional video editing software does – rather, each sequence holds a fork of nested scopes. In the header pane, this recursively nested structure is reflected as nested Gtk::Grid widgets, populated for each track with initially three rows:

• a row holding the Track Header label and menu (actually an ElementBoxWidget)
• a row corresponding to the content area of the track itself, to hold the controls to govern this track's scope, i.e. the track together with all nested sub-tracks.
• a padding row to help synchronising track head and track body display.
• Additional sub-Tracks are added as additional lines to the grid, while deeper nested sub-Tracks will be handled by the corresponding nested TrackHeadWidget. The column to the left side will be increased accordingly to display the nested fork structure.

Note

Child tracks are always appended. When tracks are reordered or deleted, the whole structure has to be re-built accordingly.

Definition at line 213 of file track-head-widget.cpp.

detachSubFork()

void detachSubFork ( TrackHeadWidget &  subForkHead )

private

remove a complete sub-fork from display.

Remarks

due to the automatic ref-counting system of GTK+, it is sufficient just to remove the entry from the Gtk::Container baseclass, which automatically decrements the refcount; alternatively we could as well destroy the Gtkmm wrapper-Object (i.e. the Gtk::Widget subclass), since this also destroys the underlying gobj and automatically detaches it from any container. (however, here this isn't necessary, since the TrackHeadWidget is managed by the DisplayFrame)

Definition at line 234 of file track-head-widget.cpp.

clearFork()

void clearFork ( )

private

Discard all nested sub track display widgets.

Definition at line 246 of file track-head-widget.cpp.

linkSubTrackPositions()

void linkSubTrackPositions ( uint  discrepancy )

private

Coordinate the exact positions of sub-Track start during DisplayEvaluaton.

Note

assuming that layout for all sub-Tracks is already final when called

Parameters

discrepancy

additional vertical offset incurred to reach a nominal height; this value is interspersed between the content cells and above the Children

Definition at line 181 of file track-head-widget.cpp.

Inheritance diagram for TrackHeadWidget:

Collaboration diagram for TrackHeadWidget:

---

The documentation for this class was generated from the following files:

• track-head-widget.hpp
• track-head-widget.cpp