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/* $Id$ */
/** @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 "../core/math_func.hpp"
#include "dropdown_type.h"
#include "table/strings.h"
void DropDownListItem::Draw(int x, int y, uint width, uint height, bool sel, int bg_colour) const
{
int c1 = _colour_gradient[bg_colour][3];
int c2 = _colour_gradient[bg_colour][7];
GfxFillRect(x + 1, y + 3, x + width - 2, y + 3, c1);
GfxFillRect(x + 1, y + 4, x + width - 2, y + 4, c2);
}
uint DropDownListStringItem::Width() const
{
char buffer[512];
GetString(buffer, this->String(), lastof(buffer));
return GetStringBoundingBox(buffer).width;
}
void DropDownListStringItem::Draw(int x, int y, uint width, uint height, bool sel, int bg_colour) const
{
DrawStringTruncated(x + 2, y, this->String(), sel ? TC_WHITE : TC_BLACK, width);
}
StringID DropDownListParamStringItem::String() const
{
for (uint i = 0; i < lengthof(this->decode_params); i++) SetDParam(i, this->decode_params[i]);
return this->string;
}
/**
* 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;
}
static const Widget _dropdown_menu_widgets[] = {
{ WWT_PANEL, RESIZE_NONE, COLOUR_END, 0, 0, 0, 0, 0x0, STR_NULL},
{ WWT_SCROLLBAR, RESIZE_NONE, COLOUR_END, 0, 0, 0, 0, 0x0, STR_0190_SCROLL_BAR_SCROLLS_LIST},
{ WIDGETS_END},
};
struct DropdownWindow : Window {
WindowClass parent_wnd_class;
WindowNumber parent_wnd_num;
byte parent_button;
DropDownList *list;
int selected_index;
byte click_delay;
bool drag_mode;
bool instant_close;
int scrolling;
DropdownWindow(int x, int y, int width, int height, const Widget *widget) : Window(x, y, width, height, WC_DROPDOWN_MENU, widget)
{
this->FindWindowPlacementAndResize(width, height);
}
~DropdownWindow()
{
Window *w2 = FindWindowById(this->parent_wnd_class, this->parent_wnd_num);
if (w2 != NULL) {
w2->RaiseWidget(this->parent_button);
w2->InvalidateWidget(this->parent_button);
}
DeleteDropDownList(this->list);
}
bool GetDropDownItem(int &value)
{
if (GetWidgetFromPos(this, _cursor.pos.x - this->left, _cursor.pos.y - this->top) < 0) return false;
int y = _cursor.pos.y - this->top - 2;
int width = this->widget[0].right - 3;
int pos = this->vscroll.pos;
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();
int x = 1;
int y = 2;
int sel = this->selected_index;
int width = this->widget[0].right - 2;
int height = this->widget[0].bottom;
int pos = this->vscroll.pos;
DropDownList *list = this->list;
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
const DropDownListItem *item = *it;
int item_height = item->Height(width);
/* Skip items that are scrolled up */
if (--pos >= 0) continue;
if (y + item_height < height) {
if (sel == item->result) GfxFillRect(x + 1, y, x + width - 1, y + item_height - 1, 0);
item->Draw(x, y, width, height, sel == item->result, (TextColour)this->widget[0].color);
if (item->masked) {
GfxFillRect(x, y, x + width - 1, y + item_height - 1,
_colour_gradient[this->widget[0].color][5], FILLRECT_CHECKER
);
}
}
y += item_height;
}
};
virtual void OnClick(Point pt, int widget)
{
if (widget != 0) return;
int item;
if (this->GetDropDownItem(item)) {
this->click_delay = 4;
this->selected_index = item;
this->SetDirty();
}
}
virtual void OnTick()
{
if (this->scrolling == -1) {
this->vscroll.pos = max(0, this->vscroll.pos - 1);
this->SetDirty();
} else if (this->scrolling == 1) {
this->vscroll.pos = min(this->vscroll.count - this->vscroll.cap, this->vscroll.pos + 1);
this->SetDirty();
}
this->scrolling = 0;
}
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)
{
bool is_dropdown_menu_shown = w->IsWidgetLowered(button);
DeleteWindowById(WC_DROPDOWN_MENU, 0);
if (is_dropdown_menu_shown) {
DeleteDropDownList(list);
return;
}
w->LowerWidget(button);
w->InvalidateWidget(button);
/* Our parent's button widget is used to determine where to place the drop
* down list window. */
const Widget *wi = &w->widget[button];
/* The preferred position is just below the dropdown calling widget */
int top = w->top + wi->bottom + 1;
if (width == 0) width = wi->right - wi->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 */
Window *w3 = FindWindowById(WC_STATUS_BAR, 0);
int screen_bottom = w3 == NULL ? _screen.height : w3->top;
bool scroll = false;
/* Check if the dropdown will fully fit below the widget */
if (top + height + 4 >= screen_bottom) {
w3 = FindWindowById(WC_MAIN_TOOLBAR, 0);
int screen_top = w3 == NULL ? 0 : w3->top + w3->height;
/* If not, check if it will fit above the widget */
if (w->top + wi->top - height > screen_top) {
top = w->top + wi->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 += 12;
}
}
if (auto_width) width = max(width, max_item_width);
DropdownWindow *dw = new DropdownWindow(
w->left + wi->left,
top,
width,
height + 4,
_dropdown_menu_widgets);
dw->widget[0].color = wi->color;
dw->widget[0].right = width - 1;
dw->widget[0].bottom = height + 3;
dw->SetWidgetHiddenState(1, !scroll);
if (scroll) {
/* We're scrolling, so enable the scroll bar and shrink the list by
* the scrollbar's width */
dw->widget[1].color = wi->color;
dw->widget[1].right = dw->widget[0].right;
dw->widget[1].left = dw->widget[1].right - 11;
dw->widget[1].bottom = dw->widget[0].bottom;
dw->widget[0].right -= 12;
/* Capacity is the average number of items visible */
dw->vscroll.cap = height * (uint16)list->size() / list_height;
dw->vscroll.count = (uint16)list->size();
}
dw->desc_flags = WDF_DEF_WIDGET;
dw->flags4 &= ~WF_WHITE_BORDER_MASK;
dw->parent_wnd_class = w->window_class;
dw->parent_wnd_num = w->window_number;
dw->parent_button = button;
dw->list = list;
dw->selected_index = selected;
dw->click_delay = 0;
dw->drag_mode = true;
dw->instant_close = instant_close;
}
void ShowDropDownMenu(Window *w, const StringID *strings, int selected, int button, uint32 disabled_mask, uint32 hidden_mask, uint width)
{
/* Don't create a new list if we're just closing an existing menu */
if (w->IsWidgetLowered(button)) {
DeleteWindowById(WC_DROPDOWN_MENU, 0);
return;
}
uint result = 0;
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], result, HasBit(disabled_mask, i)));
}
result++;
}
/* 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
*/
void 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) {
delete dw;
break;
}
}
}
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