Property Search: Quick start and clear operators

`ctrl-F` to start the search is obviously necessary, but the clear
operator, `alt-F` requires some of explanation. First, it maps nicely
to the paradigm of "key to set, alt-key to clear," which makes it
unobtrusive. Second, it can be a quicker way to clear the search than
moving the mouse to the top. Finally, in the future, it could a reset
the panels to their expansion before the search started.

Differential Revision: https://developer.blender.org/D8857

release/scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -738,6 +738,8 @@ def km_property_editor(_params):
          {"properties": [("direction", 'PREV')]}),
         ("screen.space_context_cycle", {"type": 'WHEELDOWNMOUSE', "value": 'PRESS', "ctrl": True},
          {"properties": [("direction", 'NEXT')]}),
+        ("buttons.start_filter", {"type": 'F', "value": 'PRESS', "ctrl": True}, None),
+        ("buttons.clear_filter", {"type": 'F', "value": 'PRESS', "alt": True}, None),
         # Modifier panels
         ("object.modifier_remove", {"type": 'X', "value": 'PRESS'}, {"properties": [("report", True)]}),
         ("object.modifier_remove", {"type": 'DEL', "value": 'PRESS'}, {"properties": [("report", True)]}),

source/blender/editors/space_buttons/buttons_intern.h

@@ -89,6 +89,8 @@ extern const char *buttons_context_dir[]; /* doc access */
 void buttons_texture_context_compute(const struct bContext *C, struct SpaceProperties *sbuts);
 
 /* buttons_ops.c */
+void BUTTONS_OT_start_filter(struct wmOperatorType *ot);
+void BUTTONS_OT_clear_filter(struct wmOperatorType *ot);
 void BUTTONS_OT_toggle_pin(struct wmOperatorType *ot);
 void BUTTONS_OT_file_browse(struct wmOperatorType *ot);
 void BUTTONS_OT_directory_browse(struct wmOperatorType *ot);

source/blender/editors/space_buttons/buttons_ops.c

@@ -38,6 +38,7 @@
 #include "BKE_context.h"
 #include "BKE_main.h"
 #include "BKE_report.h"
+#include "BKE_screen.h"
 
 #include "WM_api.h"
 #include "WM_types.h"
@@ -52,6 +53,65 @@
 
 #include "buttons_intern.h" /* own include */
 
+/* -------------------------------------------------------------------- */
+/** \name Start / Clear Seach Filter Operators
+ *
+ *  \note Almost a duplicate of the file browser operator #FILE_OT_start_filter.
+ * \{ */
+
+static int buttons_start_filter_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  SpaceProperties *space = CTX_wm_space_properties(C);
+  ScrArea *area = CTX_wm_area(C);
+  ARegion *region = BKE_area_find_region_type(area, RGN_TYPE_HEADER);
+
+  ARegion *region_ctx = CTX_wm_region(C);
+  CTX_wm_region_set(C, region);
+  UI_textbutton_activate_rna(C, region, space, "search_filter");
+  CTX_wm_region_set(C, region_ctx);
+
+  return OPERATOR_FINISHED;
+}
+
+void BUTTONS_OT_start_filter(struct wmOperatorType *ot)
+{
+  /* Identifiers. */
+  ot->name = "Filter";
+  ot->description = "Start entering filter text";
+  ot->idname = "BUTTONS_OT_start_filter";
+
+  /* Callbacks. */
+  ot->exec = buttons_start_filter_exec;
+  ot->poll = ED_operator_buttons_active;
+}
+
+static int buttons_clear_filter_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  SpaceProperties *space = CTX_wm_space_properties(C);
+
+  space->runtime->search_string[0] = '\0';
+
+  ScrArea *area = CTX_wm_area(C);
+  ED_region_search_filter_update(area, CTX_wm_region(C));
+  ED_area_tag_redraw(area);
+
+  return OPERATOR_FINISHED;
+}
+
+void BUTTONS_OT_clear_filter(struct wmOperatorType *ot)
+{
+  /* Identifiers. */
+  ot->name = "Clear Filter";
+  ot->description = "Clear the search filter";
+  ot->idname = "BUTTONS_OT_clear_filter";
+
+  /* Callbacks. */
+  ot->exec = buttons_clear_filter_exec;
+  ot->poll = ED_operator_buttons_active;
+}
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name Pin ID Operator
  * \{ */

source/blender/editors/space_buttons/space_buttons.c

@@ -329,6 +329,8 @@ static void buttons_main_region_listener(wmWindow *UNUSED(win),
 
 static void buttons_operatortypes(void)
 {
+  WM_operatortype_append(BUTTONS_OT_start_filter);
+  WM_operatortype_append(BUTTONS_OT_clear_filter);
   WM_operatortype_append(BUTTONS_OT_toggle_pin);
   WM_operatortype_append(BUTTONS_OT_context_menu);
   WM_operatortype_append(BUTTONS_OT_file_browse);