Secvente de cod utile

[M2G]

Postati aici secvente de cod utile, functii, clase etc...

• Postati limbajul in care este scrisa secventa de cod.
  
• Postati o descriere scurta a codului.
  
• Pentru formatare folositi syntax hilight descris aici: https://rstforums.com/forum/72004-syntax-highlight-v0-1-a.rst
  
• Nu conteaza daca este cod scris de voi sau pur si simplu ceva ca ati gasit si vi se pare util. Eventual puteti specifica daca sunteti autorul.
  

Incep eu ca si exemplu.

Limbaj: Java (Android)

Descriere:

Porneste si opreste flash-ul camerei la un dispozitiv android in mod Torch (poate sa fie folosit ca si lanterna).

Sunt foarte multe aplicatii in Google Play care fac asta si nu sunt mai complicate decat atat.

Functie pentru pornirea flash-ului:

private void startFlash() {

if (!isFlashOn) {

if (camera == null || params == null) {

return;

}

params = camera.getParameters();

params.setFlashMode(Parameters.FLASH_MODE_TORCH);

camera.setParameters(params);

camera.startPreview();

isFlashOn = true;

}

}

Functie pentru stingerea flash-ului:

private void stopFlash()

{

if (isFlashOn)

{

if (camera == null || params == null)

{

return;

}

params = camera.getParameters();

params.setFlashMode(Parameters.FLASH_MODE_OFF);

camera.setParameters(params);

camera.stopPreview();

isFlashOn = false;

}

}

Functie pentru initializarea camerei:

private void getCamera() {

if (camera == null) {

try {

camera = Camera.open();

params = camera.getParameters();

} catch (RuntimeException e) {

// error handling

}

}

}

unde camera este:

private Camera camera;

si params este:

private Parameters params;

Edited October 27, 2013 by M2G

[Eminemu]

Bookmarklet care face play/pause/frame by frame pentru orice gif din pagina.

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[M2G]

Limbaj: C++ (Qt)

Descriere: Functie care populeaza un listview cu elementele dintr-o lista

void PopulateListView(QListView* list, const QStringList& commandOutput)

{

QStandardItemModel *stdModel = new QStandardItemModel(this);

// iterate over each list element and add it to the model

for(int i=0; i<commandOutput.size(); i++)

{

stdModel->appendRow(new QStandardItem(commandOutput));

}

list->setModel(stdModel); // set the model to the listView

}

Descriere: Returneaza elementele selectate dintr-un QListView. De preferat sa fie setata lista ca single selection.

QString getSelectedListViewItem(QListView *listView)

{

QString selectedItem;

QStringList list;

// check if there are elements in the list

if (listView->model()->rowCount() > 0)

{

// get the selected element

foreach(const QModelIndex &index, listView->selectionModel()->selectedIndexes())

list.append(index.data().toString());

selectedItem = list.join(",");

}

return selectedItem;

}