slim/panel.cpp

/* SLiM - Simple Login Manager
   Copyright (C) 1997, 1998 Per Liden
   Copyright (C) 2004-06 Simone Rota <sip@varlock.com>
   Copyright (C) 2004-06 Johannes Winkelmann <jw@tks6.net>

   This program 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; either version 2 of the License, or
   (at your option) any later version.
*/

#include <sstream>
#include <poll.h>
#include "panel.h"

using namespace std;

Panel::Panel(Display* dpy, int scr, Window root, Cfg* config,
             const string& themedir) {
    // Set display
    Dpy = dpy;
    Scr = scr;
    Root = root;
    cfg = config;

    session = "";

    // Init GC
    XGCValues gcv;
    unsigned long gcm;
    gcm = GCForeground|GCBackground|GCGraphicsExposures;
    gcv.foreground = GetColor("black");
    gcv.background = GetColor("white");
    gcv.graphics_exposures = False;
    TextGC = XCreateGC(Dpy, Root, gcm, &gcv);

    font = XftFontOpenName(Dpy, Scr, cfg->getOption("input_font").c_str());
    welcomefont = XftFontOpenName(Dpy, Scr, cfg->getOption("welcome_font").c_str());
    introfont = XftFontOpenName(Dpy, Scr, cfg->getOption("intro_font").c_str());
    enterfont = XftFontOpenName(Dpy, Scr, cfg->getOption("username_font").c_str());
    msgfont = XftFontOpenName(Dpy, Scr, cfg->getOption("msg_font").c_str());

    Visual* visual = DefaultVisual(Dpy, Scr);
    Colormap colormap = DefaultColormap(Dpy, Scr);
    // NOTE: using XftColorAllocValue() would be a better solution. Lazy me.
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("input_color").c_str(), &inputcolor);
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("input_shadow_color").c_str(), &inputshadowcolor);
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("welcome_color").c_str(), &welcomecolor);
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("welcome_shadow_color").c_str(), &welcomeshadowcolor);
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("username_color").c_str(), &entercolor);
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("username_shadow_color").c_str(), &entershadowcolor);
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("msg_color").c_str(), &msgcolor);
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("msg_shadow_color").c_str(), &msgshadowcolor);
    XftColorAllocName(Dpy, visual, colormap, cfg->getOption("intro_color").c_str(), &introcolor);
    XftColorAllocName(Dpy, DefaultVisual(Dpy, Scr), colormap,
                      cfg->getOption("session_color").c_str(), &sessioncolor);
    XftColorAllocName(Dpy, DefaultVisual(Dpy, Scr), colormap,
                      cfg->getOption("session_shadow_color").c_str(), &sessionshadowcolor);

    // Load properties from config / theme
    input_name_x = cfg->getIntOption("input_name_x");
    input_name_y = cfg->getIntOption("input_name_y");
    input_pass_x = cfg->getIntOption("input_pass_x");
    input_pass_y = cfg->getIntOption("input_pass_y");
    inputShadowXOffset = cfg->getIntOption("input_shadow_xoffset");
    inputShadowYOffset = cfg->getIntOption("input_shadow_yoffset");

    if (input_pass_x < 0 || input_pass_y < 0){ // single inputbox mode
        input_pass_x = input_name_x;
        input_pass_y = input_name_y;
    }

    // Load panel and background image
    string panelpng = "";
    panelpng = panelpng + themedir +"/panel.png";
    image = new Image;
    bool loaded = image->Read(panelpng.c_str());
    if (!loaded) { // try jpeg if png failed
        panelpng = themedir + "/panel.jpg";
        loaded = image->Read(panelpng.c_str());
        if (!loaded) {
            cerr << APPNAME
                 << ": could not load panel image for theme '"
                 << basename((char*)themedir.c_str()) << "'"
                 << endl;
            exit(ERR_EXIT);
        }
    }

    Image* bg = new Image();
    string bgstyle = cfg->getOption("background_style");
    if (bgstyle != "color") {
        panelpng = themedir +"/background.png";
        loaded = bg->Read(panelpng.c_str());
        if (!loaded) { // try jpeg if png failed
            panelpng = themedir + "/background.jpg";
            loaded = bg->Read(panelpng.c_str());
            if (!loaded){
                cerr << APPNAME
                     << ": could not load background image for theme '"
                     << basename((char*)themedir.c_str()) << "'"
                     << endl;
                exit(ERR_EXIT);
            }
        }
    }
    if (bgstyle == "stretch") {
        bg->Resize(XWidthOfScreen(ScreenOfDisplay(Dpy, Scr)), XHeightOfScreen(ScreenOfDisplay(Dpy, Scr)));
    } else if (bgstyle == "tile") {
        bg->Tile(XWidthOfScreen(ScreenOfDisplay(Dpy, Scr)), XHeightOfScreen(ScreenOfDisplay(Dpy, Scr)));
    } else if (bgstyle == "center") {
        string hexvalue = cfg->getOption("background_color");
        hexvalue = hexvalue.substr(1,6);
        bg->Center(XWidthOfScreen(ScreenOfDisplay(Dpy, Scr)),
                   XHeightOfScreen(ScreenOfDisplay(Dpy, Scr)),
                   hexvalue.c_str());
    } else { // plain color or error
        string hexvalue = cfg->getOption("background_color");
        hexvalue = hexvalue.substr(1,6);
        bg->Center(XWidthOfScreen(ScreenOfDisplay(Dpy, Scr)),
                   XHeightOfScreen(ScreenOfDisplay(Dpy, Scr)),
                   hexvalue.c_str());
    }

    string cfgX = cfg->getOption("input_panel_x");
    string cfgY = cfg->getOption("input_panel_y");
    X = Cfg::absolutepos(cfgX, XWidthOfScreen(ScreenOfDisplay(Dpy, Scr)), image->Width());
    Y = Cfg::absolutepos(cfgY, XHeightOfScreen(ScreenOfDisplay(Dpy, Scr)), image->Height());

    // Merge image into background
    image->Merge(bg, X, Y);
    delete bg;
    PanelPixmap = image->createPixmap(Dpy, Scr, Root);

    // Read (and substitute vars in) the welcome message
    welcome_message = cfg->getWelcomeMessage();
    intro_message = cfg->getOption("intro_msg");
}

Panel::~Panel() {
    XftColorFree (Dpy, DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr), &inputcolor);
    XftColorFree (Dpy, DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr), &msgcolor);
    XftColorFree (Dpy, DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr), &welcomecolor);
    XftColorFree (Dpy, DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr), &entercolor);
    XftColorFree (Dpy, DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr), &sessioncolor);
    XftColorFree (Dpy, DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr), &sessionshadowcolor);
    XFreeGC(Dpy, TextGC);
    XftFontClose(Dpy, font);
    XftFontClose(Dpy, msgfont);
    XftFontClose(Dpy, introfont);
    XftFontClose(Dpy, welcomefont);
    XftFontClose(Dpy, enterfont);
    delete image;

}

void Panel::OpenPanel() {
    // Create window
    Win = XCreateSimpleWindow(Dpy, Root, X, Y,
                              image->Width(),
                              image->Height(),
                              0, GetColor("white"), GetColor("white"));

    // Events
    XSelectInput(Dpy, Win, ExposureMask | KeyPressMask);

    // Set background
    XSetWindowBackgroundPixmap(Dpy, Win, PanelPixmap);

    // Show window
    XMapWindow(Dpy, Win);
    XMoveWindow(Dpy, Win, X, Y); // override wm positioning (for tests)

    // Grab keyboard
    XGrabKeyboard(Dpy, Win, False, GrabModeAsync, GrabModeAsync, CurrentTime);

    XFlush(Dpy);

}

void Panel::ClosePanel() {
    XUngrabKeyboard(Dpy, CurrentTime);
    XUnmapWindow(Dpy, Win);
    XDestroyWindow(Dpy, Win);
    XFlush(Dpy);
}

void Panel::ClearPanel() {
    session = "";
    Reset();
    XClearWindow(Dpy, Root);
    XClearWindow(Dpy, Win);
    Cursor(SHOW);
    ShowText();
    XFlush(Dpy);
}

void Panel::Message(const string& text) {
    string cfgX, cfgY;
    XGlyphInfo extents;
    XftDraw *draw = XftDrawCreate(Dpy, Root,
                                  DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr));
    XftTextExtents8(Dpy, msgfont, reinterpret_cast<const XftChar8*>(text.c_str()),
                    text.length(), &extents);
    cfgX = cfg->getOption("msg_x");
    cfgY = cfg->getOption("msg_y");
    int shadowXOffset = cfg->getIntOption("msg_shadow_xoffset");
    int shadowYOffset = cfg->getIntOption("msg_shadow_yoffset");
    int msg_x = Cfg::absolutepos(cfgX, XWidthOfScreen(ScreenOfDisplay(Dpy, Scr)), extents.width);
    int msg_y = Cfg::absolutepos(cfgY, XHeightOfScreen(ScreenOfDisplay(Dpy, Scr)), extents.height);

    SlimDrawString8 (draw, &msgcolor, msgfont, msg_x, msg_y,
                     text,
                     &msgshadowcolor,
                     shadowXOffset, shadowYOffset);
    XFlush(Dpy);
    XftDrawDestroy(draw);
}

void Panel::Error(const string& text) {
    ClosePanel();
    Message(text);
    sleep(ERROR_DURATION);
    OpenPanel();
    ClearPanel();
}


unsigned long Panel::GetColor(const char* colorname) {
    XColor color;
    XWindowAttributes attributes;

    XGetWindowAttributes(Dpy, Root, &attributes);
    color.pixel = 0;

    if(!XParseColor(Dpy, attributes.colormap, colorname, &color))
        cerr << APPNAME << ": can't parse color " << colorname << endl;
    else if(!XAllocColor(Dpy, attributes.colormap, &color))
        cerr << APPNAME << ": can't allocate color " << colorname << endl;

    return color.pixel;
}

void Panel::Cursor(int visible) {
    const char* text;
    int xx, yy, y2, cheight;
    const char* txth = "Wj"; // used to get cursor height

    switch(field) {
        case Get_Passwd:
            text = HiddenPasswdBuffer.c_str();
            xx = input_pass_x;
            yy = input_pass_y;
            break;

        case Get_Name:
            text = NameBuffer.c_str();
            xx = input_name_x;
            yy = input_name_y;
            break;
    }

    XGlyphInfo extents;
    XftTextExtents8(Dpy, font, (XftChar8*)txth, strlen(txth), &extents);
    cheight = extents.height;
    y2 = yy - extents.y + extents.height;
    XftTextExtents8(Dpy, font, (XftChar8*)text, strlen(text), &extents);
    xx += extents.width;

    if(visible == SHOW) {
        XSetForeground(Dpy, TextGC,
                       GetColor(cfg->getOption("input_color").c_str()));
        XDrawLine(Dpy, Win, TextGC,
                  xx+1, yy-cheight,
                  xx+1, y2);
    } else {
        XClearArea(Dpy, Win, xx+1, yy-cheight,
                   1, y2-(yy-cheight)+1, false);
    }
}

void Panel::EventHandler(const Panel::FieldType& curfield) {
    XEvent event;
    field=curfield;
    bool loop = true;
    OnExpose();

    struct pollfd x11_pfd = {0};
    x11_pfd.fd = ConnectionNumber(Dpy);
    x11_pfd.events = POLLIN;
    while(loop) {
        if(XPending(Dpy) || poll(&x11_pfd, 1, -1) > 0) {
            while(XPending(Dpy)) {
                XNextEvent(Dpy, &event);
                switch(event.type) {
                    case Expose:
                        OnExpose();
                        break;

                    case KeyPress:
                        loop=OnKeyPress(event);
                        break;
                }
            }
        }
    }

    return;
}

void Panel::OnExpose(void) {
    XftDraw *draw = XftDrawCreate(Dpy, Win,
                        DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr));
    XClearWindow(Dpy, Win);
    if (input_pass_x != input_name_x || input_pass_y != input_name_y){
        SlimDrawString8 (draw, &inputcolor, font, input_name_x, input_name_y,
                         NameBuffer,
                         &inputshadowcolor,
                         inputShadowXOffset, inputShadowYOffset);
        SlimDrawString8 (draw, &inputcolor, font, input_pass_x, input_pass_y,
                         HiddenPasswdBuffer,
                         &inputshadowcolor,
                         inputShadowXOffset, inputShadowYOffset);
    } else { //single input mode
        switch(field) {
            case Get_Passwd:
                SlimDrawString8 (draw, &inputcolor, font,
                                 input_pass_x, input_pass_y,
                                 HiddenPasswdBuffer,
                                 &inputshadowcolor,
                                 inputShadowXOffset, inputShadowYOffset);
                break;
            case Get_Name:
                SlimDrawString8 (draw, &inputcolor, font,
                                 input_name_x, input_name_y,
                                 NameBuffer,
                                 &inputshadowcolor,
                                 inputShadowXOffset, inputShadowYOffset);
                break;
        }
    }

    XftDrawDestroy (draw);
    Cursor(SHOW);
    ShowText();
}

bool Panel::OnKeyPress(XEvent& event) {
    char ascii;
    KeySym keysym;
    XComposeStatus compstatus;
    int xx;
    int yy;
    string text;
    string formerString = "";
    
    XLookupString(&event.xkey, &ascii, 1, &keysym, &compstatus);
    switch(keysym){
        case XK_F1:
            SwitchSession();
            return true;

        case XK_F11:
            // Take a screenshot
            system(cfg->getOption("screenshot_cmd").c_str());
            return true;

        case XK_Return:
        case XK_KP_Enter:
            if (field==Get_Name){
                // Don't allow an empty username
                if (NameBuffer.empty()) return true;

                if (NameBuffer==CONSOLE_STR){
                    action = Console;
                } else if (NameBuffer==HALT_STR){
                    action = Halt;
                } else if (NameBuffer==REBOOT_STR){
                    action = Reboot;
                } else if (NameBuffer==SUSPEND_STR){
                    action = Suspend;
                } else if (NameBuffer==EXIT_STR){
                    action = Exit;
                } else{
                    action = Login;
                }
            };
            return false;
        default:
            break;
    };

    Cursor(HIDE);
    switch(keysym){
        case XK_Delete:
        case XK_BackSpace:
            switch(field) {
                case GET_NAME:
                    if (! NameBuffer.empty()){
                        formerString=NameBuffer;
                        NameBuffer.erase(--NameBuffer.end());
                    };
                    break;
                case GET_PASSWD:
                    if (! PasswdBuffer.empty()){
                        formerString=HiddenPasswdBuffer;
                        PasswdBuffer.erase(--PasswdBuffer.end());
                        HiddenPasswdBuffer.erase(--HiddenPasswdBuffer.end());
                    };
                    break;
            };
            break;

        case XK_w:
        case XK_u:
            if (reinterpret_cast<XKeyEvent&>(event).state & ControlMask) {
                switch(field) {
                    case Get_Passwd:
                        formerString = HiddenPasswdBuffer;
                        HiddenPasswdBuffer.clear();
                        PasswdBuffer.clear();
                        break;

                    case Get_Name:
                        formerString = NameBuffer;
                        NameBuffer.clear();
                        break;
                };
                break;
            }
            // Deliberate fall-through
        
        default:
            if (isprint(ascii) && (keysym < XK_Shift_L || keysym > XK_Hyper_R)){
                switch(field) {
                    case GET_NAME:
                        formerString=NameBuffer;
                        if (NameBuffer.length() < INPUT_MAXLENGTH_NAME-1){
                            NameBuffer.append(&ascii,1);
                        };
                        break;
                    case GET_PASSWD:
                        formerString=HiddenPasswdBuffer;
                        if (PasswdBuffer.length() < INPUT_MAXLENGTH_PASSWD-1){
                            PasswdBuffer.append(&ascii,1);
                            HiddenPasswdBuffer.append("*");
                        };
                    break;
                };
            };
            break;
    };

    XGlyphInfo extents;
    XftDraw *draw = XftDrawCreate(Dpy, Win,
                                  DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr));

   switch(field) {
        case Get_Name:
            text = NameBuffer;
            xx = input_name_x;
            yy = input_name_y;
            break;

        case Get_Passwd:
            text = HiddenPasswdBuffer;
            xx = input_pass_x;
            yy = input_pass_y;
            break;
    }

    if (!formerString.empty()){
        const char* txth = "Wj"; // get proper maximum height ?
        XftTextExtents8(Dpy, font, reinterpret_cast<const XftChar8*>(txth), strlen(txth), &extents);
        int maxHeight = extents.height;

        XftTextExtents8(Dpy, font, reinterpret_cast<const XftChar8*>(formerString.c_str()),
                        formerString.length(), &extents);
        int maxLength = extents.width;

        XClearArea(Dpy, Win, xx-3, yy-maxHeight-3,
                   maxLength+6, maxHeight+6, false);
    }

    if (!text.empty()) {
        SlimDrawString8 (draw, &inputcolor, font, xx, yy,
                         text,
                         &inputshadowcolor,
                         inputShadowXOffset, inputShadowYOffset);
    }

    XftDrawDestroy (draw);
    Cursor(SHOW);
    return true;
}

// Draw welcome and "enter username" message
void Panel::ShowText(){
    string cfgX, cfgY;
    XGlyphInfo extents;

    bool singleInputMode =
    input_name_x == input_pass_x &&
    input_name_y == input_pass_y;

    XftDraw *draw = XftDrawCreate(Dpy, Win,
                                  DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr));
    /* welcome message */
    XftTextExtents8(Dpy, welcomefont, (XftChar8*)welcome_message.c_str(),
                    strlen(welcome_message.c_str()), &extents);
    cfgX = cfg->getOption("welcome_x");
    cfgY = cfg->getOption("welcome_y");
    int shadowXOffset = cfg->getIntOption("welcome_shadow_xoffset");
    int shadowYOffset = cfg->getIntOption("welcome_shadow_yoffset");

    welcome_x = Cfg::absolutepos(cfgX, image->Width(), extents.width);
    welcome_y = Cfg::absolutepos(cfgY, image->Height(), extents.height);
    if (welcome_x >= 0 && welcome_y >= 0) {
        SlimDrawString8 (draw, &welcomecolor, welcomefont,
                         welcome_x, welcome_y,
                         welcome_message,
                         &welcomeshadowcolor, shadowXOffset, shadowYOffset);
    }

    /* Enter username-password message */
    string msg;
    if (!singleInputMode|| field == Get_Passwd ) {
        msg = cfg->getOption("password_msg");
        XftTextExtents8(Dpy, enterfont, (XftChar8*)msg.c_str(),
                        strlen(msg.c_str()), &extents);
        cfgX = cfg->getOption("password_x");
        cfgY = cfg->getOption("password_y");
        int shadowXOffset = cfg->getIntOption("username_shadow_xoffset");
        int shadowYOffset = cfg->getIntOption("username_shadow_yoffset");
        password_x = Cfg::absolutepos(cfgX, image->Width(), extents.width);
        password_y = Cfg::absolutepos(cfgY, image->Height(), extents.height);
        if (password_x >= 0 && password_y >= 0){
            SlimDrawString8 (draw, &entercolor, enterfont, password_x, password_y,
                             msg, &entershadowcolor, shadowXOffset, shadowYOffset);
        }
    }
    if (!singleInputMode|| field == Get_Name ) {
        msg = cfg->getOption("username_msg");
        XftTextExtents8(Dpy, enterfont, (XftChar8*)msg.c_str(),
                        strlen(msg.c_str()), &extents);
        cfgX = cfg->getOption("username_x");
        cfgY = cfg->getOption("username_y");
        int shadowXOffset = cfg->getIntOption("username_shadow_xoffset");
        int shadowYOffset = cfg->getIntOption("username_shadow_yoffset");
        username_x = Cfg::absolutepos(cfgX, image->Width(), extents.width);
        username_y = Cfg::absolutepos(cfgY, image->Height(), extents.height);
        if (username_x >= 0 && username_y >= 0){
            SlimDrawString8 (draw, &entercolor, enterfont, username_x, username_y,
                             msg, &entershadowcolor, shadowXOffset, shadowYOffset);
        }
    }
    XftDrawDestroy(draw);
}

string Panel::getSession() {
    return session;
}

// choose next available session type
void Panel::SwitchSession() {
    session = cfg->nextSession(session);
    if (session.size() > 0) {
        ShowSession();
    }
}

// Display session type on the screen
void Panel::ShowSession() {
	string msg_x, msg_y;
    XClearWindow(Dpy, Root);
    string currsession = cfg->getOption("session_msg") + " " + session;
    XGlyphInfo extents;
	
	sessionfont = XftFontOpenName(Dpy, Scr, cfg->getOption("session_font").c_str());
    
	XftDraw *draw = XftDrawCreate(Dpy, Root,
                                  DefaultVisual(Dpy, Scr), DefaultColormap(Dpy, Scr));
    XftTextExtents8(Dpy, sessionfont, reinterpret_cast<const XftChar8*>(currsession.c_str()),
                    currsession.length(), &extents);
    msg_x = cfg->getOption("session_x");
    msg_y = cfg->getOption("session_y");
    int x = Cfg::absolutepos(msg_x, XWidthOfScreen(ScreenOfDisplay(Dpy, Scr)), extents.width);
    int y = Cfg::absolutepos(msg_y, XHeightOfScreen(ScreenOfDisplay(Dpy, Scr)), extents.height);
    int shadowXOffset = cfg->getIntOption("session_shadow_xoffset");
    int shadowYOffset = cfg->getIntOption("session_shadow_yoffset");

    SlimDrawString8(draw, &sessioncolor, sessionfont, x, y,
                    currsession, 
                    &sessionshadowcolor,
                    shadowXOffset, shadowYOffset);
    XFlush(Dpy);
    XftDrawDestroy(draw);
}


void Panel::SlimDrawString8(XftDraw *d, XftColor *color, XftFont *font,
                            int x, int y, const string& str,
                            XftColor* shadowColor,
                            int xOffset, int yOffset)
{
    if (xOffset && yOffset) {
        XftDrawString8(d, shadowColor, font, x+xOffset, y+yOffset,
                       reinterpret_cast<const FcChar8*>(str.c_str()), str.length());
    }
    XftDrawString8(d, color, font, x, y, reinterpret_cast<const FcChar8*>(str.c_str()), str.length());
}

Panel::ActionType Panel::getAction(void) const{
    return action;
};

void Panel::Reset(void){
    ResetName();
    ResetPasswd();
};

void Panel::ResetName(void){
    NameBuffer.clear();
};

void Panel::ResetPasswd(void){
    PasswdBuffer.clear();
    HiddenPasswdBuffer.clear();
};

void Panel::SetName(const string& name){
    NameBuffer=name;
    action = Login;
};

const string& Panel::GetName(void) const{
    return NameBuffer;
};

const string& Panel::GetPasswd(void) const{
    return PasswdBuffer;
};