@c8y/style/styles/core/forms/_file-picker.less

Styles for Cumulocity IoT applications

@import "../../mixins/_gradients.less";
@import "../../mixins/_opacity.less";

/**
 * File Picker - File upload component with drag-and-drop
 *
 * Note: Uses @size-* tokens for spacing where applicable.
 *
 * Intentionally hardcoded values:
 * - Component-specific sizes (36px, 28px, 100px, 150px, 300px): Icon and container dimensions
 * - Fine-tuning offsets (3px, 6px): Positioning adjustments
 * - Border widths (2px): Standard dashed borders
 * - Transition duration (0.35s): Animation timing
 * - Transform scale (1.1): Hover effect
 */

// Shared mixin for upload status/placeholder styling
.upload-elements-styling() {
  .upload-status,
  .upload-placeholder {
    padding: 0 @size-16;
    width: 100%;
  }
}

// Shared mixin for alert positioning
.alert-positioning() {
  .alert {
    position: absolute;
    bottom: 0;
    margin: 0;
    width: 100%;
  }
}

// Shared mixin for file placeholder icon styling
.file-placeholder-icon() {
  [class^='dlt-c8y-icon-'],
  [class*=' dlt-c8y-icon-'] {
    color: @component-brand-primary;
    font-size: 36px;
    transition: all 0.35s ease;
  }
}

// Shared mixin for icon hover/drag-over effect
.icon-hover-effect() {
  .hint-placeholder {
    [class^='dlt-c8y-icon-'],
    [class*=' dlt-c8y-icon-'] {
      transform: scale(1.1);
    }
  }
}

// Shared mixin for error state styling
.file-placeholder-error() {
  &.has-errors .file-placeholder {
    border-bottom-style: solid;
    border-bottom-color: @form-control-validation-error;
  }
}

c8y-drop-area {
  display: block;
}

.drop-zone {
  position: relative;
  display: block;
  padding-bottom: 100%;
  height: 0;
  .alert-positioning();
  .upload-elements-styling();
  .file-placeholder {
    position: absolute;
    display: flex;
    align-items: center;
    flex-flow: column nowrap;
    justify-content: center;
    width: 100%;
    height: 100%;
    border: 2px dashed @component-border-color;
    color: @component-color-default;
    text-align: center;
    transition: border 0.25s ease;
    .hint-placeholder {
      .file-placeholder-icon();
    }

    &.drag-over,
    &:hover {
      border-color: @component-brand-primary;
      .icon-hover-effect();
    }
  }
  .file-placeholder-error();
  &.drop-zone-sm,
  .drop-area-sm & {
    padding: 0;
    min-height: unset !important;
    height: auto;
    .alert {
      position: relative;
    }
    .file-placeholder {
      position: static;
      display: block;
      .hint-placeholder {
        position: relative;
        padding: @size-10 @size-10 @size-10 50px;
        text-align: left;
        [class^='dlt-c8y-icon-'],
        [class*=' dlt-c8y-icon-'] {
          position: absolute;
          top: 50%;
          left: 3px;

          transform: translate(0, -50%);
        }
        p {
          margin-bottom: 0;
        }
      }
      &:hover,
      &.drag-over {
        .hint-placeholder [class^='dlt-c8y-icon-'],
        .hint-placeholder [class*=' dlt-c8y-icon-'] {
          transform: translate(0, -50%) scale(1.1);
        }
      }
    }
  }
  .drop-area-sm & {
    .file-placeholder {
      .hint-placeholder {
        [class^='dlt-c8y-icon-'],
        [class*=' dlt-c8y-icon-'] {
          left: @size-8;
          font-size: 28px;
        }
        p {
          br {
            display: contents;
            + span {
              margin-left: 6px;
            }
          }
        }
      }
    }
  }
  &.disabled {
    &,
    &:hover,
    &:focus {
      pointer-events: none !important;
      cursor: @cursor-disabled !important;
      color: @component-color-default;
      .opacity(0.65);
      box-shadow: none;
    }
  }
}

c8y-file-picker-form-control {
  .file-picker-drop-zone {
    display: flex;
    flex-direction: column;
    min-height: 150px;
    height: fit-content;
    transition: min-height 0.25s ease;
    padding: @size-10;

    &.unsupported-format {
      background-size: 100px 100px;
      .gradient-striped(rgba(0, 0, 0, 0.10));
    }

    &.dragging {
      min-height: 300px;
    }
    .alert-positioning();
    .upload-elements-styling();
    .file-placeholder {
      flex: 1;
      display: flex;
      align-items: center;
      flex-flow: column nowrap;
      justify-content: center;
      height: 100%;
      border: 2px dashed @component-border-color;
      color: @component-color-default;
      text-align: center;
      transition: border 0.25s ease;

      .hint-placeholder {
        .file-placeholder-icon();
        [class^='dlt-c8y-icon-'],
        [class*=' dlt-c8y-icon-'] {
          &.warning {
            color: var(--palette-status-warning, var(--c8y-palette-status-warning));
          }
        }
      }

      > * {
        pointer-events: none;
      }
      &.drag-over,
      &:hover {
        border-color: @component-brand-primary;
        .icon-hover-effect();
      }
    }
    .file-placeholder-error();
  }
}