/* $Id$ */
/*
* 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 .
*/
/** @file dropdown.cpp Implementation of the dropdown widget. */
#include "../stdafx.h"
#include "../window_gui.h"
#include "../string_func.h"
#include "../strings_func.h"
#include "../window_func.h"
#include "../guitimer_func.h"
#include "dropdown_type.h"
#include "dropdown_widget.h"
#include "../safeguards.h"
void DropDownListItem::Draw(int left, int right, int top, int bottom, bool sel, Colours 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, Colours bg_colour) const
{
DrawString(left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, top, this->String(), sel ? TC_WHITE : TC_BLACK);
}
/**
* Natural sorting comparator function for DropDownList::sort().
* @param first Left side of comparison.
* @param second Right side of comparison.
* @return true if \a first precedes \a second.
* @warning All items in the list need to be derivates of DropDownListStringItem.
*/
/* static */ int DropDownListStringItem::NatSortFunc(const DropDownListItem * const *first, const DropDownListItem * const * second)
{
char buffer1[512], buffer2[512];
GetString(buffer1, static_cast(*first)->String(), lastof(buffer1));
GetString(buffer2, static_cast(*second)->String(), lastof(buffer2));
return strnatcmp(buffer1, buffer2);
}
StringID DropDownListParamStringItem::String() const
{
for (uint i = 0; i < lengthof(this->decode_params); i++) SetDParam(i, this->decode_params[i]);
return this->string;
}
StringID DropDownListCharStringItem::String() const
{
SetDParamStr(0, this->raw_string);
return this->string;
}
static const NWidgetPart _nested_dropdown_menu_widgets[] = {
NWidget(NWID_HORIZONTAL),
NWidget(WWT_PANEL, COLOUR_END, WID_DM_ITEMS), SetMinimalSize(1, 1), SetScrollbar(WID_DM_SCROLL), EndContainer(),
NWidget(NWID_SELECTION, INVALID_COLOUR, WID_DM_SHOW_SCROLL),
NWidget(NWID_VSCROLLBAR, COLOUR_END, WID_DM_SCROLL),
EndContainer(),
EndContainer(),
};
static WindowDesc _dropdown_desc(
WDP_MANUAL, NULL, 0, 0,
WC_DROPDOWN_MENU, WC_NONE,
WDF_NO_FOCUS,
_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.
int parent_button; ///< Parent widget number where the window is dropped from.
const 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).
GUITimer scrolling_timer; ///< Timer for auto-scroll of the item list.
Point position; ///< Position of the topleft corner of the window.
Scrollbar *vscroll;
/**
* 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.
*/
DropdownWindow(Window *parent, const DropDownList *list, int selected, int button, bool instant_close, const Point &position, const Dimension &size, Colours wi_colour, bool scroll)
: Window(&_dropdown_desc)
{
assert(list->Length() > 0);
this->position = position;
this->CreateNestedTree();
this->vscroll = this->GetScrollbar(WID_DM_SCROLL);
uint items_width = size.width - (scroll ? NWidgetScrollbar::GetVerticalDimension().width : 0);
NWidgetCore *nwi = this->GetWidget(WID_DM_ITEMS);
nwi->SetMinimalSize(items_width, size.height + 4);
nwi->colour = wi_colour;
nwi = this->GetWidget(WID_DM_SCROLL);
nwi->colour = wi_colour;
this->GetWidget(WID_DM_SHOW_SCROLL)->SetDisplayedPlane(scroll ? 0 : SZSP_NONE);
this->FinishInitNested(0);
CLRBITS(this->flags, WF_WHITE_BORDER);
/* Total length of list */
int list_height = 0;
for (const DropDownListItem * const *it = list->Begin(); it != list->End(); ++it) {
const DropDownListItem *item = *it;
list_height += item->Height(items_width);
}
/* Capacity is the average number of items visible */
this->vscroll->SetCapacity(size.height * (uint16)list->Length() / list_height);
this->vscroll->SetCount((uint16)list->Length());
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;
this->scrolling_timer = GUITimer(MILLISECONDS_PER_TICK);
}
~DropdownWindow()
{
/* Make the dropdown "invisible", so it doesn't affect new window placement.
* Also mark it dirty in case the callback deals with the screen. (e.g. screenshots). */
this->window_class = WC_INVALID;
this->SetDirty();
Window *w2 = FindWindowById(this->parent_wnd_class, this->parent_wnd_num);
if (w2 != NULL) {
Point pt = _cursor.pos;
pt.x -= w2->left;
pt.y -= w2->top;
w2->OnDropdownClose(pt, this->parent_button, this->selected_index, this->instant_close);
}
delete this->list;
}
virtual Point OnInitialPosition(int16 sm_width, int16 sm_height, int window_number)
{
return this->position;
}
/**
* Find the dropdown item under the cursor.
* @param[out] value 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(WID_DM_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 (const DropDownListItem * const *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 DrawWidget(const Rect &r, int widget) const
{
if (widget != WID_DM_ITEMS) return;
Colours colour = this->GetWidget(widget)->colour;
int y = r.top + 2;
int pos = this->vscroll->GetPosition();
for (const DropDownListItem * const *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, PC_BLACK);
item->Draw(r.left, r.right, y, y + item_height, 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, int click_count)
{
if (widget != WID_DM_ITEMS) return;
int item;
if (this->GetDropDownItem(item)) {
this->click_delay = 4;
this->selected_index = item;
this->SetDirty();
}
}
virtual void OnRealtimeTick(uint delta_ms)
{
if (!this->scrolling_timer.Elapsed(delta_ms)) return;
this->scrolling_timer.SetInterval(MILLISECONDS_PER_TICK);
if (this->scrolling != 0) {
int pos = this->vscroll->GetPosition();
this->vscroll->UpdatePosition(this->scrolling);
this->scrolling = 0;
if (pos != this->vscroll->GetPosition()) {
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) {
/* Make the dropdown "invisible", so it doesn't affect new window placement.
* Also mark it dirty in case the callback deals with the screen. (e.g. screenshots). */
this->window_class = WC_INVALID;
this->SetDirty();
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) 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;
}
if (this->selected_index != item) {
this->selected_index = item;
this->SetDirty();
}
}
}
};
/**
* Show a drop down list.
* @param w Parent window for the list.
* @param list Prepopulated DropDownList. Will be deleted when the list is
* closed.
* @param selected The initially selected list item.
* @param button The widget which is passed to Window::OnDropdownSelect and OnDropdownClose.
* Unless you override those functions, this should be then widget index of the dropdown button.
* @param wi_rect Coord of the parent drop down button, used to position the dropdown menu.
* @param auto_width The width is determined by the widest item in the list,
* in this case only one of \a left or \a right is used (depending on text direction).
* @param instant_close Set to true if releasing mouse button should close the
* list regardless of where the cursor is.
*/
void ShowDropDownListAt(Window *w, const DropDownList *list, int selected, int button, Rect wi_rect, Colours wi_colour, bool auto_width, bool instant_close)
{
DeleteWindowById(WC_DROPDOWN_MENU, 0);
/* The preferred position is just below the dropdown calling widget */
int top = w->top + wi_rect.bottom + 1;
/* The preferred width equals the calling widget */
uint width = wi_rect.right - wi_rect.left + 1;
/* Longest item in the list, if auto_width is enabled */
uint max_item_width = 0;
/* Total height of list */
uint height = 0;
for (const DropDownListItem * const *it = list->Begin(); it != list->End(); ++it) {
const DropDownListItem *item = *it;
height += item->Height(width);
if (auto_width) max_item_width = max(max_item_width, item->Width() + 5);
}
/* Scrollbar needed? */
bool scroll = false;
/* Is it better to place the dropdown above the widget? */
bool above = false;
/* Available height below (or above, if the dropdown is placed above the widget). */
uint available_height = (uint)max(GetMainViewBottom() - top - 4, 0);
/* If the dropdown doesn't fully fit below the widget... */
if (height > available_height) {
uint available_height_above = (uint)max(w->top + wi_rect.top - GetMainViewTop() - 4, 0);
/* Put the dropdown above if there is more available space. */
if (available_height_above > available_height) {
above = true;
available_height = available_height_above;
}
/* If the dropdown doesn't fully fit, we need a dropdown. */
if (height > available_height) {
scroll = true;
uint avg_height = height / list->Length();
/* Check at least there is space for one item. */
assert(available_height >= avg_height);
/* Fit the list. */
uint rows = available_height / avg_height;
height = rows * avg_height;
/* Add space for the scrollbar. */
max_item_width += NWidgetScrollbar::GetVerticalDimension().width;
}
/* Set the top position if needed. */
if (above) {
top = w->top + wi_rect.top - height - 4;
}
}
if (auto_width) width = max(width, max_item_width);
Point dw_pos = { w->left + (_current_text_dir == TD_RTL ? wi_rect.right + 1 - (int)width : wi_rect.left), top};
Dimension dw_size = {width, height};
DropdownWindow *dropdown = new DropdownWindow(w, list, selected, button, instant_close, dw_pos, dw_size, wi_colour, scroll);
/* The dropdown starts scrolling downwards when opening it towards
* the top and holding down the mouse button. It can be fooled by
* opening the dropdown scrolled to the very bottom. */
if (above && scroll) dropdown->vscroll->UpdatePosition(INT_MAX);
}
/**
* Show a drop down list.
* @param w Parent window for the list.
* @param list Prepopulated DropDownList. Will be deleted when the list is
* closed.
* @param selected The initially selected list item.
* @param button The widget within the parent window that is used to determine
* the list's location.
* @param width Override the width determined by the selected widget.
* @param auto_width Maximum width is determined by the widest item in the list.
* @param instant_close Set to true if releasing mouse button should close the
* list regardless of where the cursor is.
*/
void ShowDropDownList(Window *w, const DropDownList *list, int selected, int button, uint width, bool auto_width, bool instant_close)
{
/* Our parent's button widget is used to determine where to place the drop
* down list window. */
Rect wi_rect;
NWidgetCore *nwi = w->GetWidget(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;
Colours wi_colour = nwi->colour;
if ((nwi->type & WWT_MASK) == NWID_BUTTON_DROPDOWN) {
nwi->disp_flags |= ND_DROPDOWN_ACTIVE;
} else {
w->LowerWidget(button);
}
w->SetWidgetDirty(button);
if (width != 0) {
if (_current_text_dir == TD_RTL) {
wi_rect.left = wi_rect.right + 1 - width;
} else {
wi_rect.right = wi_rect.left + width - 1;
}
}
ShowDropDownListAt(w, list, selected, button, wi_rect, wi_colour, auto_width, instant_close);
}
/**
* Show a dropdown menu window near a widget of the parent window.
* The result code of the items is their index in the \a 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 \a w that wants the dropdown menu.
* @param disabled_mask Bitmask for disabled items (items with their bit set are displayed, but not selectable in the dropdown list).
* @param hidden_mask Bitmask for hidden items (items with their bit set are not copied to the dropdown list).
* @param width Width of the dropdown menu. If \c 0, use the width of parent widget \a 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->Append() = new DropDownListStringItem(strings[i], i, HasBit(disabled_mask, i));
}
}
/* No entries in the list? */
if (list->Length() == 0) {
delete 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(w);
assert(dw != NULL);
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;
}