Added buttons to collapse or expand ALL groups.

(cherry picked from commit bb6b96e8663b5cb3da87d8473e70e373a36b3997)

src/group_gui.cpp

@@ -31,6 +31,7 @@
 #include "table/sprites.h"
 
 #include "safeguards.h"
+#include <algorithm>
 
 static const int LEVEL_WIDTH = 10; ///< Indenting width of a sub-group in pixels
 
@@ -65,6 +66,10 @@ static const NWidgetPart _nested_group_widgets[] = {
 				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_GL_RENAME_GROUP), SetFill(0, 1),
 						SetDataTip(SPR_GROUP_RENAME_TRAIN, STR_GROUP_RENAME_TOOLTIP),
 				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_GL_COLLAPSE_EXPAND_GROUP), SetFill(0, 1),
+				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_GL_COLLAPSE_ALL_GROUPS), SetFill(0, 1),
+						SetDataTip(STR_GROUP_COLLAPSE_ALL, STR_GROUP_COLLAPSE_ALL),
+				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_GL_EXPAND_ALL_GROUPS), SetFill(0, 1),
+						SetDataTip(STR_GROUP_EXPAND_ALL, STR_GROUP_EXPAND_ALL),
 				NWidget(WWT_PANEL, COLOUR_GREY), SetFill(1, 1), EndContainer(),
 				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_GL_REPLACE_PROTECTION), SetFill(0, 1),
 						SetDataTip(SPR_GROUP_REPLACE_OFF_TRAIN, STR_GROUP_REPLACE_PROTECTION_TOOLTIP),
@@ -699,6 +704,28 @@ public:
 				this->SetDirty();
 				break;
 
+			case WID_GL_COLLAPSE_ALL_GROUPS: {				
+				std::for_each(_collapsed_groups.begin(), _collapsed_groups.end(), [](std::pair<const GroupID, bool> &key_value_pair) {
+					if (key_value_pair.first != ALL_GROUP && key_value_pair.first != DEFAULT_GROUP && key_value_pair.first != INVALID_GROUP) {
+						key_value_pair.second = true;
+					}
+				});
+				OnInvalidateData();
+				this->SetDirty();
+				break;
+			}
+
+			case WID_GL_EXPAND_ALL_GROUPS: {				
+				std::for_each(_collapsed_groups.begin(), _collapsed_groups.end(), [](std::pair<const GroupID, bool> &key_value_pair) {
+					if (key_value_pair.first != ALL_GROUP && key_value_pair.first != DEFAULT_GROUP && key_value_pair.first != INVALID_GROUP) {
+						key_value_pair.second = false;
+					}
+				});
+				OnInvalidateData();
+				this->SetDirty();
+				break;
+			}
+
 			case WID_GL_AVAILABLE_VEHICLES:
 				ShowBuildVehicleWindow(INVALID_TILE, this->vli.vtype);
 				break;

src/lang/english.txt

@@ -3355,6 +3355,8 @@ STR_GROUP_DELETE_TOOLTIP                                        :{BLACK}Delete t
 STR_GROUP_RENAME_TOOLTIP                                        :{BLACK}Rename the selected group
 STR_GROUP_COLLAPSE                                              :{BLACK}Collapse
 STR_GROUP_EXPAND                                                :{BLACK}Expand
+STR_GROUP_EXPAND_ALL                                           :{BLACK}Expand all
+STR_GROUP_COLLAPSE_ALL                                         :{BLACK}Collapse all
 STR_GROUP_COLLAPSE_TOOLTIP                                      :{BLACK}Click to collapse the selected group
 STR_GROUP_EXPAND_TOOLTIP                                        :{BLACK}Click to expand the selected group
 STR_GROUP_REPLACE_PROTECTION_TOOLTIP                            :{BLACK}Click to protect this group from global autoreplace

src/widgets/group_widget.h

@@ -32,6 +32,8 @@ enum GroupListWidgets {
 	WID_GL_DELETE_GROUP,             ///< Delete group button.
 	WID_GL_RENAME_GROUP,             ///< Rename group button.
 	WID_GL_COLLAPSE_EXPAND_GROUP,    ///< Collapse/expand group button.
+	WID_GL_COLLAPSE_ALL_GROUPS,      ///< Collapse all groups button.
+	WID_GL_EXPAND_ALL_GROUPS,        ///< Expand all groups button.
 	WID_GL_REPLACE_PROTECTION,       ///< Replace protection button.
 };