/*
 * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

@import "../mixins/_focus.css";
@import "../mixins/_shadow.css";

:root {
	--ck-widget-outline-thickness: 3px;
	--ck-widget-handler-icon-size: 16px;
	--ck-widget-handler-animation-duration: 200ms;
	--ck-widget-handler-animation-curve: ease;

	--ck-color-widget-blurred-border: hsl(0, 0%, 87%);
	--ck-color-widget-hover-border: hsl(43, 100%, 62%);
	--ck-color-widget-editable-focus-background: var(--ck-color-base-background);
	--ck-color-widget-drag-handler-icon-color: var(--ck-color-base-background);
}

.ck .ck-widget {
	outline-width: var(--ck-widget-outline-thickness);
	outline-style: solid;
	outline-color: transparent;
	transition: outline-color var(--ck-widget-handler-animation-duration) var(--ck-widget-handler-animation-curve);

	&.ck-widget_selected,
	&.ck-widget_selected:hover {
		outline: var(--ck-widget-outline-thickness) solid var(--ck-color-focus-border);
	}

	&:hover {
		outline-color: var(--ck-color-widget-hover-border);
	}
}

.ck .ck-editor__nested-editable {
	border: 1px solid transparent;

	/* The :focus style is applied before .ck-editor__nested-editable_focused class is rendered in the view.
	These styles show a different border for a blink of an eye, so `:focus` need to have same styles applied. */
	&.ck-editor__nested-editable_focused,
	&:focus {
		@mixin ck-focus-ring;
		@mixin ck-box-shadow var(--ck-inner-shadow);

		background-color: var(--ck-color-widget-editable-focus-background);
	}
}

.ck .ck-widget.ck-widget_with-selection-handle {
	& .ck-widget__selection-handle {
		padding: 4px;
		box-sizing: border-box;

		/* Background and opacity will be animated as the handler shows up or the widget gets selected. */
		background-color: transparent;
		opacity: 0;

		/* Transition:
		   * background-color for the .ck-widget_selected state change,
		   * visibility for hiding the handler,
		   * opacity for the proper look of the icon when the handler disappears. */
		transition:
			background-color var(--ck-widget-handler-animation-duration) var(--ck-widget-handler-animation-curve),
			visibility var(--ck-widget-handler-animation-duration) var(--ck-widget-handler-animation-curve),
			opacity var(--ck-widget-handler-animation-duration) var(--ck-widget-handler-animation-curve);

		/* Make only top corners round. */
		border-radius: var(--ck-border-radius) var(--ck-border-radius) 0 0;

		/* Place the drag handler outside the widget wrapper. */
		transform: translateY(-100%);
		left: calc(0px - var(--ck-widget-outline-thickness));

		& .ck-icon {
			/* Make sure the dimensions of the icon are independent of the fon-size of the content. */
			width: var(--ck-widget-handler-icon-size);
			height: var(--ck-widget-handler-icon-size);
			color: var(--ck-color-widget-drag-handler-icon-color);

			/* The "selected" part of the icon is invisible by default */
			& .ck-icon__selected-indicator {
				opacity: 0;

				/* Note: The animation is longer on purpose. Simply feels better. */
				transition: opacity 300ms var(--ck-widget-handler-animation-curve);
			}
		}

		/* Advertise using the look of the icon that once clicked the handler, the widget will be selected. */
		&:hover .ck-icon .ck-icon__selected-indicator {
			opacity: 1;
		}
	}

	/* Show the selection handler on mouse hover over the widget. */
	&:hover .ck-widget__selection-handle {
		opacity: 1;
		background-color: var(--ck-color-widget-hover-border);
	}

	/* Show the selection handler when the widget is selected. */
	&.ck-widget_selected,
	&.ck-widget_selected:hover {
		& .ck-widget__selection-handle {
			opacity: 1;
			background-color: var(--ck-color-focus-border);

			/* When the widget is selected, notify the user using the proper look of the icon. */
			& .ck-icon .ck-icon__selected-indicator {
				opacity: 1;
			}
		}
	}
}

/* In a RTL environment, align the selection handler to the right side of the widget */
/* stylelint-disable-next-line no-descending-specificity */
.ck[dir="rtl"] .ck-widget.ck-widget_with-selection-handle .ck-widget__selection-handle {
	left: auto;
	right: calc(0px - var(--ck-widget-outline-thickness));
}

/* https://github.com/ckeditor/ckeditor5/issues/6415 */
.ck.ck-editor__editable.ck-read-only .ck-widget {
	/* Prevent the :hover outline from showing up because of the used outline-color transition. */
	transition: none;

	&:not(.ck-widget_selected) {
		/* Disable visual effects of hover/active widget when CKEditor is in readOnly mode.
		 * See: https://github.com/ckeditor/ckeditor5/issues/1261
		 *
		 * Leave the unit because this custom property is used in calc() by other features.
		 * See: https://github.com/ckeditor/ckeditor5/issues/6775
		 */
		--ck-widget-outline-thickness: 0px;
	}

	&.ck-widget_with-selection-handle {
		& .ck-widget__selection-handle,
		& .ck-widget__selection-handle:hover {
			background: var(--ck-color-widget-blurred-border);
		}
	}
}

/* Style the widget when it's selected but the editable it belongs to lost focus. */
/* stylelint-disable-next-line no-descending-specificity */
.ck.ck-editor__editable.ck-blurred .ck-widget {
	&.ck-widget_selected,
	&.ck-widget_selected:hover {
		outline-color: var(--ck-color-widget-blurred-border);

		&.ck-widget_with-selection-handle {
			& .ck-widget__selection-handle,
			& .ck-widget__selection-handle:hover {
				background: var(--ck-color-widget-blurred-border);
			}
		}
	}
}

.ck.ck-editor__editable > .ck-widget.ck-widget_with-selection-handle:first-child,
.ck.ck-editor__editable blockquote > .ck-widget.ck-widget_with-selection-handle:first-child {
	/* Do not crop selection handler if a widget is a first-child in the blockquote or in the root editable.
	In fact, anything with overflow: hidden.
	https://github.com/ckeditor/ckeditor5-block-quote/issues/28
	https://github.com/ckeditor/ckeditor5-widget/issues/44
	https://github.com/ckeditor/ckeditor5-widget/issues/66 */
	margin-top: calc(1em + var(--ck-widget-handler-icon-size));
}
