// iOS View Transitions
// -------------------------------

$ios-transition-duration:              450ms !default;
$ios-transition-timing-function:       cubic-bezier(.3, .9, .4, 1) !default;
$ios-transition-container-bg-color:    #000 !default;


[nav-view-transition="ios"] {

  [nav-view="entering"],
  [nav-view="leaving"] {
    @include transition-duration( $ios-transition-duration );
    @include transition-timing-function( $ios-transition-timing-function );
    -webkit-transition-property: opacity, -webkit-transform;
            transition-property: opacity, transform;
  }

  &[nav-view-direction="forward"],
  &[nav-view-direction="back"] {
    background-color: $ios-transition-container-bg-color;
  }

  [nav-view="active"],
  &[nav-view-direction="forward"] [nav-view="entering"],
  &[nav-view-direction="back"] [nav-view="leaving"] {
    z-index: $z-index-view-above;
  }

  &[nav-view-direction="back"] [nav-view="entering"],
  &[nav-view-direction="forward"] [nav-view="leaving"] {
    z-index: $z-index-view-below;
  }

}



// iOS Nav Bar Transitions
// -------------------------------

[nav-bar-transition="ios"] {

  .title,
  .buttons,
  .back-text {
    @include transition-duration( $ios-transition-duration );
    @include transition-timing-function( $ios-transition-timing-function );
    -webkit-transition-property: opacity, -webkit-transform;
            transition-property: opacity, transform;
  }

  [nav-bar="active"],
  [nav-bar="entering"] {
    z-index: $z-index-bar-above;

   .bar {
      background: transparent;
    }
  }

  [nav-bar="cached"] {
    display: block;

    .header-item {
      display: none;
    }
  }

}



// Android View Transitions
// -------------------------------

$android-transition-duration:             200ms !default;
$android-transition-timing-function:      cubic-bezier(0.4, 0.6, 0.2, 1) !default;


[nav-view-transition="android"] {

  [nav-view="entering"],
  [nav-view="leaving"] {
    @include transition-duration( $android-transition-duration );
    @include transition-timing-function( $android-transition-timing-function );
    -webkit-transition-property: -webkit-transform;
            transition-property: transform;
  }

  [nav-view="active"],
  &[nav-view-direction="forward"] [nav-view="entering"],
  &[nav-view-direction="back"] [nav-view="leaving"] {
    z-index: $z-index-view-above;
  }

  &[nav-view-direction="back"] [nav-view="entering"],
  &[nav-view-direction="forward"] [nav-view="leaving"] {
    z-index: $z-index-view-below;
  }

}



// Android Nav Bar Transitions
// -------------------------------

[nav-bar-transition="android"] {

  .title,
  .buttons {
    @include transition-duration( $android-transition-duration );
    @include transition-timing-function( $android-transition-timing-function );
    -webkit-transition-property: opacity;
            transition-property: opacity;
  }

  [nav-bar="active"],
  [nav-bar="entering"] {
    z-index: $z-index-bar-above;

   .bar {
      background: transparent;
    }
  }

  [nav-bar="cached"] {
    display: block;

    .header-item {
      display: none;
    }
  }

}



// Transition Settings
// -------------------------------

[nav-view="cached"],
[nav-bar="cached"] {
  display: none;
}

[nav-view="stage"] {
  opacity: 0;
  @include transition-duration( 0 );
}

[nav-bar="stage"] {
  .title,
  .buttons,
  .back-text {
    position: absolute;
    opacity: 0;
    @include transition-duration(0s);
  }
}