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UI: Add shadow to panels

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At the moment, only menus and tooltips have a shadow. However, other
elements can benefit from having a shadow. This PR adds shadows to
panels in overlapped regions.  Makes the default shadow size slightly
larger, but less opaque so it's not so prominent. While dragging a
panel this makes the shadow larger for a "floating" effect.

Pull Request: https://projects.blender.org/blender/blender/pulls/139847
This commit is contained in:
Pablo Vazquez
2025-06-19 02:21:35 +02:00
committed by Harley Acheson
parent 2a86a93349
commit 0a22fbc153
5 changed files with 43 additions and 5 deletions
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4
release/datafiles/userdef/userdef_default_theme.c
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@@ -239,8 +239,8 @@ const bTheme U_theme_default = {
.blend = 0.5f,
},
.widget_emboss = RGBA(0x00000026),
.menu_shadow_fac = 0.4f,
.menu_shadow_width = 2,
.menu_shadow_fac = 0.2f,
.menu_shadow_width = 6,
.editor_border = RGBA(0x161616ff),
.editor_outline = RGBA(0xffffff15),
.editor_outline_active = RGBA(0xffffff2a),

2
source/blender/blenkernel/BKE_blender_version.h
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@@ -27,7 +27,7 @@
/* Blender file format version. */
#define BLENDER_FILE_VERSION BLENDER_VERSION
#define BLENDER_FILE_SUBVERSION 18
#define BLENDER_FILE_SUBVERSION 19
/* Minimum Blender version that supports reading file written with the current
* version. Older Blender versions will test this and cancel loading the file, showing a warning to

5
source/blender/blenloader/intern/versioning_userdef.cc
View File

@@ -326,6 +326,11 @@ static void do_versions_theme(const UserDef *userdef, bTheme *btheme)
FROM_DEFAULT_V4_UCHAR(space_preferences.button);
}
if (!USER_VERSION_ATLEAST(500, 19)) {
btheme->tui.menu_shadow_fac = U_theme_default.tui.menu_shadow_fac;
btheme->tui.menu_shadow_width = U_theme_default.tui.menu_shadow_width;
}
/**
* Always bump subversion in BKE_blender_version.h when adding versioning
* code here, and wrap it inside a USER_VERSION_ATLEAST check.

32
source/blender/editors/interface/interface_panel.cc
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@@ -1233,6 +1233,21 @@ void ui_draw_layout_panels_backdrop(const ARegion *region,
}
}
static void panel_draw_softshadow(const rctf *box_rect,
const int roundboxalign,
const float radius,
const float shadow_width)
{
const float outline = U.pixelsize;
rctf shadow_rect = *box_rect;
BLI_rctf_pad(&shadow_rect, -outline, -outline);
UI_draw_roundbox_corner_set(roundboxalign);
const float shadow_alpha = UI_GetTheme()->tui.menu_shadow_fac;
ui_draw_dropshadow(&shadow_rect, radius, shadow_width, 1.0f, shadow_alpha);
}
static void panel_draw_aligned_backdrop(const ARegion *region,
const Panel *panel,
const rcti *rect,
@@ -1241,6 +1256,7 @@ static void panel_draw_aligned_backdrop(const ARegion *region,
const bool is_open = !UI_panel_is_closed(panel);
const bool is_subpanel = panel->type->parent != nullptr;
const bool has_header = (panel->type->flag & PANEL_TYPE_NO_HEADER) == 0;
const bool is_dragging = UI_panel_is_dragging(panel);
if (is_subpanel && !is_open) {
return;
@@ -1253,6 +1269,22 @@ static void panel_draw_aligned_backdrop(const ARegion *region,
immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
GPU_blend(GPU_BLEND_ALPHA);
/* Draw shadow on top-level panels with headers during drag or region overlap. */
if (!is_subpanel && has_header && (region->overlap || is_dragging)) {
/* Make shadow wider (at least 16px) while the panel is being dragged. */
const float shadow_width = is_dragging ?
max_ii(int(16.0f * UI_SCALE_FAC), UI_ThemeMenuShadowWidth()) :
UI_ThemeMenuShadowWidth();
const int roundboxalign = is_open ? UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT : UI_CNR_ALL;
rctf box_rect;
box_rect.xmin = rect->xmin;
box_rect.xmax = rect->xmax;
box_rect.ymin = is_open ? rect->ymin : header_rect->ymin;
box_rect.ymax = header_rect->ymax;
panel_draw_softshadow(&box_rect, roundboxalign, radius, shadow_width);
}
/* Panel backdrop. */
if (is_open || !has_header) {
float panel_backcolor[4];

5
source/blender/makesrna/intern/rna_userdef.cc
View File

@@ -1912,13 +1912,14 @@ static void rna_def_userdef_theme_ui(BlenderRNA *brna)
RNA_def_property_update(prop, 0, "rna_userdef_theme_update");
prop = RNA_def_property(srna, "menu_shadow_fac", PROP_FLOAT, PROP_FACTOR);
RNA_def_property_ui_text(prop, "Menu Shadow Strength", "Blending factor for menu shadows");
RNA_def_property_ui_text(
prop, "Panel/Menu Shadow Strength", "Blending factor for panel and menu shadows");
RNA_def_property_range(prop, 0.01f, 1.0f);
RNA_def_property_update(prop, 0, "rna_userdef_theme_update");
prop = RNA_def_property(srna, "menu_shadow_width", PROP_INT, PROP_PIXEL);
RNA_def_property_ui_text(
prop, "Menu Shadow Width", "Width of menu shadows, set to zero to disable");
prop, "Panel/Menu Shadow Width", "Width of panel and menu shadows, set to zero to disable");
RNA_def_property_range(prop, 0.0f, 24.0f);
RNA_def_property_update(prop, 0, "rna_userdef_theme_update");