numix-gtk-theme/gtk-3.20/scss/widgets/_notebook.scss

@import "button";


/**********
 ! Notebook
***********/

@include exports("notebook") {
    notebook {
        > header {
            padding: 1px;
            border-color: $borders_color;
            border-width: 1px;
            background-color: shade($base_color, .9);

            &:backdrop {
                border-color: $backdrop_borders_color;
                background-color: shade($backdrop_base_color, .9);
            }

            tabs { margin: -1px; }

            &.top {
                border-bottom-style: solid;

                > tabs {
                    margin-bottom: -2px;

                    > tab {
                        &:hover { box-shadow: inset 0 -3px $borders_color; }

                        &:backdrop { box-shadow: none; }

                        &:checked { box-shadow: inset 0 -3px $selected_bg_color; }
                    }
                }
            }

            &.bottom {
                border-top-style: solid;

                > tabs {
                    margin-top: -2px;

                    > tab {
                        &:hover { box-shadow: inset 0 3px $borders_color; }

                        &:backdrop { box-shadow: none; }

                        &:checked { box-shadow: inset 0 3px $selected_bg_color; }
                    }
                }
            }

            &.left {
                border-right-style: solid;

                > tabs {
                    margin-right: -2px;

                    > tab {
                        &:hover { box-shadow: inset -3px 0 $borders_color; }

                        &:backdrop { box-shadow: none; }

                        &:checked { box-shadow: inset -3px 0 $selected_bg_color; }
                    }
                }
            }

            &.right {
                border-left-style: solid;

                > tabs {
                    margin-left: -2px;

                    > tab {
                        &:hover { box-shadow: inset 3px 0 $borders_color; }

                        &:backdrop { box-shadow: none; }

                        &:checked { box-shadow: inset 3px 0 $selected_bg_color; }
                    }
                }
            }

            &.top > tabs > arrow {
                @extend %notebook_vert_arrows;

                border-top-style: none;
            }

            &.bottom > tabs > arrow {
                @extend %notebook_vert_arrows;

                border-bottom-style: none;
            }

            @at-root %notebook_vert_arrows {
                margin-left: 0;
                margin-right: 0;
                padding-left: 4px;
                padding-right: 4px;

                &.down { -gtk-icon-source: -gtk-icontheme('pan-start-symbolic'); }

                &.up { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic'); }
            }

            &.left > tabs > arrow {
                @extend %notebook_horz_arrows;

                border-left-style: none;
            }

            &.right > tabs > arrow {
                @extend %notebook_horz_arrows;

                border-right-style: none;
            }

            @at-root %notebook_horz_arrows {
                margin-top: 0;
                margin-bottom: 0;
                padding-top: 4px;
                padding-bottom: 4px;

                &.down { -gtk-icon-source: -gtk-icontheme('pan-up-symbolic'); }

                &.up { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
            }

            > tabs > arrow {
                //@extend %button_basic;

                //@extend %button_basic.flat;

                min-height: 16px;
                min-width: 16px;
                border-radius: 0;

                &:hover:not(:active):not(:backdrop) {
                    background-clip: padding-box;
                    background-image: none;
                    background-color: transparentize(white, .7);
                    border-color: transparent;
                    box-shadow: none;
                }

                //&:disabled { @include button(undecorated); }
            }

            tab {
                min-height: 30px;
                min-width: 30px;
                padding: $spacing $spacing * 2;

                outline-offset: -5px;

                color: $insensitive_fg_color;
                border-width: 1px;         // for reorderable tabs
                border-color: transparent; //

                &:hover {
                    color: mix($insensitive_fg_color, $fg_color, .5);

                    &.reorderable-page {
                        border-color: transparentize($borders_color, .7);
                        background-color: transparentize($base_color, .8);
                    }
                }

                &:backdrop {
                    color: mix($backdrop_fg_color, $backdrop_bg_color, .6);

                    &.reorderable-page {
                        border-color: transparent;
                        background-color: transparent;
                    }
                }

                &:checked {
                    color: $fg_color;

                    &.reorderable-page {
                        border-color: transparentize($borders_color, .4);
                        background-color: transparentize($base_color, .5);

                        &:hover { background-color: transparentize($base_color, .3); }
                    }
                }

                &:backdrop:checked {
                    color: $backdrop_fg_color;

                    &.reorderable-page {
                        border-color: $backdrop_borders_color;
                        background-color: $backdrop_base_color;
                    }
                }

                // colors the button like the label, overridden otherwise
                button.flat {
                    &:hover { color: currentColor; }

                    &, &:backdrop { color: gtkalpha(currentColor, .3); }

                    padding: 0;
                    margin-top: 4px;
                    margin-bottom: 4px;
                    // FIXME: generalize .small-button?
                    min-width: 20px;
                    min-height: 20px;

                    &:last-child {
                        margin-left: 4px;
                        margin-right: -4px;
                    }

                    &:first-child {
                        margin-left: -4px;
                        margin-right: 4px;
                    }
                }
            }

            &.top,
            &.bottom {
                tabs {
                    padding-left: 0;
                    padding-right: 0;

                    &:not(:only-child) {
                        margin-left: 3px;
                        margin-right: 3px;

                        &:first-child { margin-left: -1px; }
                        &:last-child { margin-right: -1px; }
                    }

                    tab {
                        margin-left: 0;
                        margin-right: 0;

                        &.reorderable-page { border-style: none solid; }
                    }
                }
            }

            &.left,
            &.right {
                tabs {
                    padding-top: 0;
                    padding-bottom: 0;

                    &:not(:only-child) {
                        margin-top: 3px;
                        margin-bottom: 3px;

                        &:first-child { margin-top: -1px; }
                        &:last-child { margin-bottom: -1px; }
                    }

                    tab {
                        margin-top: 0;
                        margin-bottom: 0;

                        &.reorderable-page { border-style: solid none; }
                    }
                }
            }

            &.top tab { padding-bottom: 4px; }
            &.bottom tab { padding-top: 4px; }
        }

        > stack:not(:only-child) { // the :not(:only-child) is for "hidden" notebooks
            background-color: $base_color;

            &:backdrop { background-color: $backdrop_base_color; }
        }
    }
}