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Location: cpp/openttd-patchpack/source/src/widgets/dropdown.cpp
r13962:aec40147ce1d
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(svn r18510) -Codechange: some further cleanups of the Windows installer; it didn't always remove all the files it installed and the downloaded free graphics/sounds are now fully extracted instead of dumped as tar in the data directory. This should make reading the readme for them quite a bit easier.
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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file dropdown.cpp Implementation of the dropdown widget. */
#include "../stdafx.h"
#include "../window_gui.h"
#include "../strings_func.h"
#include "../gfx_func.h"
#include "../window_func.h"
#include "dropdown_type.h"
void DropDownListItem::Draw(int left, int right, int top, int bottom, bool sel, int bg_colour) const
{
int c1 = _colour_gradient[bg_colour][3];
int c2 = _colour_gradient[bg_colour][7];
int mid = top + this->Height(0) / 2;
GfxFillRect(left + 1, mid - 2, right - 1, mid - 2, c1);
GfxFillRect(left + 1, mid - 1, right - 1, mid - 1, c2);
}
uint DropDownListStringItem::Width() const
{
char buffer[512];
GetString(buffer, this->String(), lastof(buffer));
return GetStringBoundingBox(buffer).width;
}
void DropDownListStringItem::Draw(int left, int right, int top, int bottom, bool sel, int bg_colour) const
{
DrawString(left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, top, this->String(), sel ? TC_WHITE : TC_BLACK);
}
StringID DropDownListParamStringItem::String() const
{
for (uint i = 0; i < lengthof(this->decode_params); i++) SetDParam(i, this->decode_params[i]);
return this->string;
}
uint DropDownListCharStringItem::Width() const
{
return GetStringBoundingBox(this->string).width;
}
void DropDownListCharStringItem::Draw(int left, int right, int top, int bottom, bool sel, int bg_colour) const
{
DrawString(left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, top, this->string, sel ? TC_WHITE : TC_BLACK);
}
/**
* Delete all items of a drop down list and the list itself
* @param list List to delete.
*/
static void DeleteDropDownList(DropDownList *list)
{
for (DropDownList::iterator it = list->begin(); it != list->end(); ++it) {
DropDownListItem *item = *it;
delete item;
}
delete list;
}
/** Widget numbers of the dropdown menu. */
enum DropdownMenuWidgets {
DDM_ITEMS, ///< Panel showing the dropdown items.
DDM_SCROLL, ///< Scrollbar.
};
static const NWidgetPart _nested_dropdown_menu_widgets[] = {
NWidget(NWID_HORIZONTAL),
NWidget(WWT_PANEL, COLOUR_END, DDM_ITEMS), SetMinimalSize(1, 1), EndContainer(),
NWidget(WWT_SCROLLBAR, COLOUR_END, DDM_SCROLL),
EndContainer(),
};
const WindowDesc _dropdown_desc(
WDP_MANUAL, 0, 0,
WC_DROPDOWN_MENU, WC_NONE,
0,
_nested_dropdown_menu_widgets, lengthof(_nested_dropdown_menu_widgets)
);
/** Drop-down menu window */
struct DropdownWindow : Window {
WindowClass parent_wnd_class; ///< Parent window class.
WindowNumber parent_wnd_num; ///< Parent window number.
byte parent_button; ///< Parent widget number where the window is dropped from.
DropDownList *list; ///< List with dropdown menu items.
int selected_index; ///< Index of the selected item in the list.
byte click_delay; ///< Timer to delay selection.
bool drag_mode;
bool instant_close; ///< Close the window when the mouse button is raised.
int scrolling; ///< If non-zero, auto-scroll the item list (one time).
Point position; ///< Position of the topleft corner of the window.
/** Create a dropdown menu.
* @param parent Parent window.
* @param list Dropdown item list.
* @param selected Index of the selected item in the list.
* @param button Widget of the parent window doing the dropdown.
* @param instant_close Close the window when the mouse button is raised.
* @param position Topleft position of the dropdown menu window.
* @param size Size of the dropdown menu window.
* @param wi_colour Colour of the parent widget.
* @param scroll Dropdown menu has a scrollbar.
* @param widget Widgets of the dropdown menu window.
*/
DropdownWindow(Window *parent, DropDownList *list, int selected, int button, bool instant_close, const Point &position, const Dimension &size, Colours wi_colour, bool scroll) : Window()
{
this->position = position;
this->CreateNestedTree(&_dropdown_desc);
uint items_width = size.width - (scroll ? WD_VSCROLLBAR_WIDTH : 0);
NWidgetCore *nwi = this->GetWidget<NWidgetCore>(DDM_ITEMS);
nwi->SetMinimalSize(items_width, size.height + 4);
nwi->colour = wi_colour;
nwi = this->GetWidget<NWidgetCore>(DDM_SCROLL);
if (scroll) {
nwi->colour = wi_colour;
} else {
nwi->min_x = 0; // Make scrollbar invisible.
}
this->FinishInitNested(&_dropdown_desc, 0);
this->flags4 &= ~WF_WHITE_BORDER_MASK;
/* Total length of list */
int list_height = 0;
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
DropDownListItem *item = *it;
list_height += item->Height(items_width);
}
/* Capacity is the average number of items visible */
this->vscroll.SetCapacity(size.height * (uint16)list->size() / list_height);
this->vscroll.SetCount((uint16)list->size());
this->parent_wnd_class = parent->window_class;
this->parent_wnd_num = parent->window_number;
this->parent_button = button;
this->list = list;
this->selected_index = selected;
this->click_delay = 0;
this->drag_mode = true;
this->instant_close = instant_close;
}
~DropdownWindow()
{
Window *w2 = FindWindowById(this->parent_wnd_class, this->parent_wnd_num);
if (w2 != NULL) {
if (w2->nested_array != NULL) {
NWidgetCore *nwi2 = w2->GetWidget<NWidgetCore>(this->parent_button);
if (nwi2->type == NWID_BUTTON_DROPDOWN) {
nwi2->disp_flags &= ~ND_DROPDOWN_ACTIVE;
} else {
w2->RaiseWidget(this->parent_button);
}
} else {
w2->RaiseWidget(this->parent_button);
}
w2->SetWidgetDirty(this->parent_button);
}
DeleteDropDownList(this->list);
}
virtual Point OnInitialPosition(const WindowDesc *desc, int16 sm_width, int16 sm_height, int window_number)
{
return this->position;
}
/** Find the dropdown item under the cursor.
* @param value [out] Selected item, if function returns \c true.
* @return Cursor points to a dropdown item.
*/
bool GetDropDownItem(int &value)
{
if (GetWidgetFromPos(this, _cursor.pos.x - this->left, _cursor.pos.y - this->top) < 0) return false;
NWidgetBase *nwi = this->GetWidget<NWidgetBase>(DDM_ITEMS);
int y = _cursor.pos.y - this->top - nwi->pos_y - 2;
int width = nwi->current_x - 4;
int pos = this->vscroll.GetPosition();
const DropDownList *list = this->list;
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
/* Skip items that are scrolled up */
if (--pos >= 0) continue;
const DropDownListItem *item = *it;
int item_height = item->Height(width);
if (y < item_height) {
if (item->masked || !item->Selectable()) return false;
value = item->result;
return true;
}
y -= item_height;
}
return false;
}
virtual void OnPaint()
{
this->DrawWidgets();
}
virtual void DrawWidget(const Rect &r, int widget) const
{
if (widget != DDM_ITEMS) return;
TextColour colour = (TextColour)this->GetWidget<NWidgetCore>(widget)->colour;
int y = r.top + 2;
int pos = this->vscroll.GetPosition();
for (DropDownList::const_iterator it = this->list->begin(); it != this->list->end(); ++it) {
const DropDownListItem *item = *it;
int item_height = item->Height(r.right - r.left + 1);
/* Skip items that are scrolled up */
if (--pos >= 0) continue;
if (y + item_height < r.bottom) {
bool selected = (this->selected_index == item->result);
if (selected) GfxFillRect(r.left + 2, y, r.right - 1, y + item_height - 1, 0);
item->Draw(r.left, r.right, y, r.bottom, selected, colour);
if (item->masked) {
GfxFillRect(r.left + 1, y, r.right - 1, y + item_height - 1, _colour_gradient[colour][5], FILLRECT_CHECKER);
}
}
y += item_height;
}
}
virtual void OnClick(Point pt, int widget)
{
if (widget != DDM_ITEMS) return;
int item;
if (this->GetDropDownItem(item)) {
this->click_delay = 4;
this->selected_index = item;
this->SetDirty();
}
}
virtual void OnTick()
{
this->vscroll.UpdatePosition(this->scrolling);
this->scrolling = 0;
this->SetDirty();
}
virtual void OnMouseLoop()
{
Window *w2 = FindWindowById(this->parent_wnd_class, this->parent_wnd_num);
if (w2 == NULL) {
delete this;
return;
}
if (this->click_delay != 0 && --this->click_delay == 0) {
w2->OnDropdownSelect(this->parent_button, this->selected_index);
delete this;
return;
}
if (this->drag_mode) {
int item;
if (!_left_button_clicked) {
this->drag_mode = false;
if (!this->GetDropDownItem(item)) {
if (this->instant_close) {
if (GetWidgetFromPos(w2, _cursor.pos.x - w2->left, _cursor.pos.y - w2->top) == this->parent_button) {
/* Send event for selected option if we're still
* on the parent button of the list. */
w2->OnDropdownSelect(this->parent_button, this->selected_index);
}
delete this;
}
return;
}
this->click_delay = 2;
} else {
if (_cursor.pos.y <= this->top + 2) {
/* Cursor is above the list, set scroll up */
this->scrolling = -1;
return;
} else if (_cursor.pos.y >= this->top + this->height - 2) {
/* Cursor is below list, set scroll down */
this->scrolling = 1;
return;
}
if (!this->GetDropDownItem(item)) return;
}
this->selected_index = item;
this->SetDirty();
}
}
};
void ShowDropDownList(Window *w, DropDownList *list, int selected, int button, uint width, bool auto_width, bool instant_close)
{
DeleteWindowById(WC_DROPDOWN_MENU, 0);
/* Our parent's button widget is used to determine where to place the drop
* down list window. */
Rect wi_rect;
Colours wi_colour;
NWidgetCore *nwi = w->GetWidget<NWidgetCore>(button);
wi_rect.left = nwi->pos_x;
wi_rect.right = nwi->pos_x + nwi->current_x - 1;
wi_rect.top = nwi->pos_y;
wi_rect.bottom = nwi->pos_y + nwi->current_y - 1;
wi_colour = nwi->colour;
if (nwi->type == NWID_BUTTON_DROPDOWN) {
nwi->disp_flags |= ND_DROPDOWN_ACTIVE;
} else {
w->LowerWidget(button);
}
w->SetWidgetDirty(button);
/* The preferred position is just below the dropdown calling widget */
int top = w->top + wi_rect.bottom + 1;
if (width == 0) width = wi_rect.right - wi_rect.left + 1;
uint max_item_width = 0;
if (auto_width) {
/* Find the longest item in the list */
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
const DropDownListItem *item = *it;
max_item_width = max(max_item_width, item->Width() + 5);
}
}
/* Total length of list */
int list_height = 0;
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
DropDownListItem *item = *it;
list_height += item->Height(width);
}
/* Height of window visible */
int height = list_height;
/* Check if the status bar is visible, as we don't want to draw over it */
int screen_bottom = GetMainViewBottom();
bool scroll = false;
/* Check if the dropdown will fully fit below the widget */
if (top + height + 4 >= screen_bottom) {
/* If not, check if it will fit above the widget */
if (w->top + wi_rect.top - height > GetMainViewTop()) {
top = w->top + wi_rect.top - height - 4;
} else {
/* ... and lastly if it won't, enable the scroll bar and fit the
* list in below the widget */
int avg_height = list_height / (int)list->size();
int rows = (screen_bottom - 4 - top) / avg_height;
height = rows * avg_height;
scroll = true;
/* Add space for the scroll bar if we automatically determined
* the width of the list. */
max_item_width += WD_VSCROLLBAR_WIDTH;
}
}
if (auto_width) width = max(width, max_item_width);
Point dw_pos = { w->left + (_dynlang.text_dir == TD_RTL ? wi_rect.right + 1 - width : wi_rect.left), top};
Dimension dw_size = {width, height};
new DropdownWindow(w, list, selected, button, instant_close, dw_pos, dw_size, wi_colour, scroll);
}
/** Show a dropdown menu window near a widget of the parent window.
* The result code of the items is their index in the #strings list.
* @param w Parent window that wants the dropdown menu.
* @param strings Menu list, end with #INVALID_STRING_ID
* @param selected Index of initial selected item.
* @param button Button widget number of the parent window #w that wants the dropdown menu.
* @param disabled_mask Bitmask for diabled items (items with their bit set are not copied to the dropdown list).
* @param hidden_mask Bitmask for hidden items (items with their bit set are displayed, but not selectable in the dropdown list).
* @param width Width of the dropdown menu. If \c 0, use the width of parent widget #button.
*/
void ShowDropDownMenu(Window *w, const StringID *strings, int selected, int button, uint32 disabled_mask, uint32 hidden_mask, uint width)
{
DropDownList *list = new DropDownList();
for (uint i = 0; strings[i] != INVALID_STRING_ID; i++) {
if (!HasBit(hidden_mask, i)) {
list->push_back(new DropDownListStringItem(strings[i], i, HasBit(disabled_mask, i)));
}
}
/* No entries in the list? */
if (list->size() == 0) {
DeleteDropDownList(list);
return;
}
ShowDropDownList(w, list, selected, button, width);
}
/**
* Delete the drop-down menu from window \a pw
* @param pw Parent window of the drop-down menu window
* @return Parent widget number if the drop-down was found and closed, \c -1 if the window was not found.
*/
int HideDropDownMenu(Window *pw)
{
Window *w;
FOR_ALL_WINDOWS_FROM_BACK(w) {
if (w->window_class != WC_DROPDOWN_MENU) continue;
DropdownWindow *dw = dynamic_cast<DropdownWindow*>(w);
if (pw->window_class == dw->parent_wnd_class &&
pw->window_number == dw->parent_wnd_num) {
int parent_button = dw->parent_button;
delete dw;
return parent_button;
}
}
return -1;
}
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