/**
* Projcets the given object on the projector. If the object is non-stable, all other non-stable
* elements will be removed and added to the history.
*
* @param projector The projector to add the object to.
* @param obj The object to project
*/
public async projectOn(
projector: Projector,
obj: Projectable | ProjectorElementBuildDeskriptor | IdentifiableProjectorElement
): Promise<void> {
const element = this.getProjectorElement(obj);
if (element.stable) {
// remove the same element, if it is currently projected
projector.removeElements(element);
// Add this stable element
projector.addElement(element);
await this.projectRequest(projector, projector.elements);
} else {
// For non-stable elements remove all other non-stable elements, add them to the history and
// add the one new element to the projector.
const removedElements = projector.removeAllNonStableElements();
let changed = removedElements.length > 0;
if (element) {
projector.addElement(element);
changed = true;
}
if (changed) {
await this.projectRequest(projector, projector.elements, null, removedElements);
}
}
}
/**
* Projects one slide (given by the index of the preview) on the given projector. Moves
* all current projected non-stable elements to the history.
*
* @param projector The projector
* @param previewIndex The index in the `elements_preview` array.
*/
public async projectPreviewSlide(projector: Projector, previewIndex: number): Promise<void> {
if (projector.elements_preview.length === 0 || previewIndex >= projector.elements_preview.length) {
return;
}
const removedElements = projector.removeAllNonStableElements();
projector.addElement(projector.elements_preview.splice(previewIndex, 1)[0]);
await this.projectRequest(projector, projector.elements, projector.elements_preview, removedElements);
}
/**
* Creates the comment section from the create form.
*/
public create(): void {
if (this.createForm.valid && this.projectorToCreate) {
this.projectorToCreate.patchValues(this.createForm.value as Projector);
this.projectorToCreate.patchValues({
reference_projector_id: this.projectors[0].reference_projector_id
});
this.repo.create(this.projectorToCreate).then(() => (this.projectorToCreate = null), this.raiseError);
}
}
/**
* Projects the last slide of the history. This slide will be removed from the history.
*
* @param projector The projector
*/
public async projectPreviousSlide(projector: Projector): Promise<void> {
if (projector.elements_history.length === 0) {
return;
}
// Get the last element from the history
const lastElements: ProjectorElements = projector.elements_history[projector.elements_history.length - 1];
let lastElement: ProjectorElement = null;
if (lastElements.length > 0) {
lastElement = lastElements[0];
}
// Add all current elements to the preview.
const removedElements = projector.removeAllNonStableElements();
removedElements.forEach(e => projector.elements_preview.unshift(e));
// Add last element
if (lastElement) {
projector.addElement(lastElement);
}
await this.projectRequest(projector, projector.elements, projector.elements_preview, null, true);
}
/**
* Removes the given object from the projector. Non stable elements will be added to the history.
*
* @param projector The projector
* @param obj the object to unproject
*/
public async removeFrom(
projector: Projector,
obj: Projectable | ProjectorElementBuildDeskriptor | IdentifiableProjectorElement
): Promise<void> {
const element = this.getProjectorElement(obj);
const removedElements = projector.removeElements(element);
if (removedElements.length > 0) {
if (element.stable) {
await this.projectRequest(projector, projector.elements);
} else {
// For non-stable elements: Add removed elements to the history.
await this.projectRequest(projector, projector.elements, null, removedElements);
}
}
}
/**
* Checks, if the object is projected on the given projector.
*
* @param obj The object
* @param projector The projector to test
* @returns true, if the object is projected on the projector.
*/
public isProjectedOn(
obj: Projectable | ProjectorElementBuildDeskriptor | IdentifiableProjectorElement,
projector: Projector
): boolean {
return projector.isElementShown(this.getProjectorElement(obj));
}