Start redesign

gtk-3.0/scss/widgets/_overshoot.scss

@@ -0,0 +1,123 @@
+@mixin overshoot($position, $type: normal, $color: $selected_bg_color) {
+    $_small_gradient_length: 5%;
+    $_big_gradient_length: 100%;
+
+    $_position: center top;
+    $_small_gradient_size: 100% $_small_gradient_length;
+    $_big_gradient_size: 100% $_big_gradient_length;
+
+    @if $position == bottom {
+        $_position: center bottom;
+        $_linear_gradient_direction: to top;
+    }
+
+    @else if $position == right {
+        $_position: right center;
+        $_small_gradient_size: $_small_gradient_length 100%;
+        $_big_gradient_size: $_big_gradient_length 100%;
+    }
+
+    @else if $position == left {
+        $_position: left center;
+        $_small_gradient_size: $_small_gradient_length 100%;
+        $_big_gradient_size: $_big_gradient_length 100%;
+    }
+
+    $_small_gradient_color: $color;
+    $_big_gradient_color: $color;
+
+    $_small_gradient: -gtk-gradient(radial,
+                                    $_position, 0,
+                                    $_position, 0.5,
+                                    to(alpha($_small_gradient_color, .35)),
+                                    to(alpha($_small_gradient_color, .25)));
+
+    $_big_gradient: -gtk-gradient(radial,
+                                  $_position, 0,
+                                  $_position, 0.6,
+                                  from(alpha($_big_gradient_color, .2)),
+                                  to(alpha($_big_gradient_color, 0)));
+
+    @if $type == normal {
+        background-image: $_small_gradient, $_big_gradient;
+        background-size: $_small_gradient_size, $_big_gradient_size;
+    } @else if $type == backdrop {
+        background-image: $_small_gradient;
+        background-size: $_small_gradient_size;
+    }
+
+    background-repeat: no-repeat;
+    background-position: $_position;
+
+    background-color: transparent; // reset some properties to be sure to not inherit them somehow
+    border: none;
+    box-shadow: none;
+}
+
+@mixin undershoot($position) {
+    $_undershoot_color_dark: alpha(black, .2);
+    $_undershoot_color_light: alpha(white, .2);
+
+    $_gradient_dir: left;
+    $_dash_bg_size: 10px 1px;
+    $_gradient_repeat: repeat-x;
+    $_bg_pos: center $position;
+
+    background-color: transparent; // shouldn't be needed, but better to be sure;
+
+    @if ($position == left) or ($position == right) {
+        $_gradient_dir: top;
+        $_dash_bg_size: 1px 10px;
+        $_gradient_repeat: repeat-y;
+        $_bg_pos: $position center;
+    }
+
+    background-image: linear-gradient(to $_gradient_dir, // this is the dashed line
+                                         $_undershoot_color_light 50%,
+                                         $_undershoot_color_dark 50%);
+
+    padding-#{$position}: 1px;
+    background-size: $_dash_bg_size;
+    background-repeat: $_gradient_repeat;
+    background-origin: content-box;
+    background-position: $_bg_pos;
+}
+
+// This is used by GtkScrolledWindow, when content is touch-dragged past boundaries.
+// This draws a box on top of the content, the size changes programmatically.
+.overshoot {
+    &.top {
+        @include overshoot(top);
+
+        &:backdrop { @include overshoot(top, backdrop); }
+    }
+
+    &.bottom {
+        @include overshoot(bottom);
+
+        &:backdrop { @include overshoot(bottom, backdrop); }
+    }
+
+    &.left {
+        @include overshoot(left);
+
+        &:backdrop { @include overshoot(left, backdrop); }
+    }
+
+    &.right {
+        @include overshoot(right);
+
+        &:backdrop { @include overshoot(right, backdrop); }
+    }
+}
+
+// Overflow indication, works similarly to the overshoot, the size if fixed tho.
+.undershoot {
+    &.top { @include undershoot(top); }
+
+    &.bottom { @include undershoot(bottom); }
+
+    &.left { @include undershoot(left); }
+
+    &.right { @include undershoot(right); }
+}